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The Following brands are available based on your search.

  • Bosal
    Bosal
  • DEC
    DEC
  • Davico Converters
    Davico Converters
  • Eastern Catalytic
    Eastern Catalytic
  • MagnaFlow Performance Exhaust
    MagnaFlow Performance Exhaust
  • Magnaflow
    Magnaflow
  • PaceSetter
    PaceSetter
  • Walker
    Walker

Best Selling Genuine Mitsubishi Catalytic Converters

  • We Stock the following top leading brands, including Magnaflow, Eastern Catalytic
  • Constantly Updated Inventory of Mitsubishi Replacement Catalytic Converter Parts

We stock Catalytic Converter parts for most Mitsubishi models, including 3000GT, Diamante, Eclipse, Galant, Lancer, Mirage, Montero, Montero Sport, Outlander.

Magnaflow
Qty:
$187.21
Magnaflow Catalytic Converter  Front
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : TLEV OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Front
Additional Fitment Information:
Vehicle Position Block Engine CID CC
1995 - Mitsubishi Mirage Front L 4 Cyl 1.8L 112 1834
Magnaflow
Qty:
$187.21
Magnaflow Catalytic Converter  Front
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : LEV1 LEV OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Front
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2001 - Mitsubishi Mirage Front L 4 Cyl 1.5L 90 1468
Magnaflow
Qty:
$187.21
Magnaflow Catalytic Converter  Front Left
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : LEV1 LEV OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Front Left
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2001 - Mitsubishi Galant Front Left V 6 Cyl 3.0L 181 2972
Magnaflow
Qty:
$107.12
Magnaflow Catalytic Converter  Rear
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : LEV1 LEV OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Rear
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2000 - Mitsubishi Mirage Rear L 4 Cyl 1.8L 112 1834
Magnaflow
Qty:
$107.12
Magnaflow Catalytic Converter  Rear
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : TLEV OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Rear
Additional Fitment Information:
Vehicle Position Block Engine CID CC
1995 - Mitsubishi Mirage Rear L 4 Cyl 1.8L 112 1834
Magnaflow
Qty:
$187.21
Magnaflow Catalytic Converter  Front Left
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : TIER1 OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Front Left
Additional Fitment Information:
Vehicle Position Block Engine CID CC
1995 - Mitsubishi Diamante Front Left V 6 Cyl 3.0L 181 2972
Magnaflow
Qty:
$107.12
Magnaflow Catalytic Converter  Rear Right
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : TIER1 OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Rear Right
Additional Fitment Information:
Vehicle Position Block Engine CID CC
1995 - Mitsubishi Diamante Rear Right V 6 Cyl 3.0L 181 2972
Magnaflow
Qty:
$107.12
Magnaflow Catalytic Converter  Rear Right
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : LEV1 LEV OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Rear Right
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2003 - Mitsubishi Diamante Rear Right V 6 Cyl 3.5L 215 3497
Magnaflow
Qty:
$187.21
Magnaflow Catalytic Converter  Front Right
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : LEV1 LEV OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Front Right
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2004 - Mitsubishi Eclipse Front Right V 6 Cyl 3.0L 181 2972
Magnaflow
Qty:
$187.21
Magnaflow Catalytic Converter  Front Right
  • Universal Catalytic Converter - 2.00in.
  • Certification Level : TIER1 OE Spec Cutting and welding required during installation
  • 2in. Universal California OBDII Catalytic Converter
  • Product Attributes:
    • Body Shape: Oval
    • Body Type: Clam Shell
    • Series: California
    • Substrate Material: Ceramic
    • Title: Universal Converter
Brand: Magnaflow
Position: Front Right
Additional Fitment Information:
Vehicle Position Block Engine CID CC
1995 - Mitsubishi Diamante Front Right V 6 Cyl 3.0L 181 2972
Eastern Catalytic
Qty:
$50.29
Eastern Catalytic Catalytic Converter
  • Federal / EPA Semi-Universal Converter - Standard
  • Undercar Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Standard
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.25" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.25" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology also helps to maintain industry-leading efficiency, productivity, and competitive prices. The proprietary NANO substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency.
Brand: Eastern Catalytic
Additional Fitment Information:
Vehicle Block Engine CID CC
1989 - Mitsubishi Starion L 4 Cyl 2.6L 156 2555
Eastern Catalytic
Qty:
$71.13
Eastern Catalytic Catalytic Converter
  • Federal / EPA Semi-Universal Converter - ECO II
  • Undercar Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Eco Ii
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.25" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.25" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Proprietary ECO II NANO substrate chemistry is designed to be effective on most complex or second-generation on board diagnostics (OBD II) systems and yields highly efficient loadings for lower cost and better converter efficiency. Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology helps to maintain industry-leading efficiency, productivity, and competitive prices.
Brand: Eastern Catalytic
Additional Fitment Information:
Vehicle Submodel Drive Type Aspiration Block Engine CID CC
1999 - Mitsubishi Eclipse GSX AWD Turbocharged L 4 Cyl 2.0L 122 1997
Eastern Catalytic
Qty:
$50.29
Eastern Catalytic Catalytic Converter
  • Federal / EPA Semi-Universal Converter - Standard
  • Undercar Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Standard
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.00" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.00" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology also helps to maintain industry-leading efficiency, productivity, and competitive prices. The proprietary NANO substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency.
Brand: Eastern Catalytic
Additional Fitment Information:
Vehicle Drive Type Block Engine CID CC
1995 - Mitsubishi Mighty Max RWD L 4 Cyl 2.4L - 2351
Eastern Catalytic
Qty:
$50.29
Eastern Catalytic Catalytic Converter  Rear
  • Federal / EPA Semi-Universal Converter - Standard
  • Undercar Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Standard
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.00" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.00" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology also helps to maintain industry-leading efficiency, productivity, and competitive prices. The proprietary NANO substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency.
Brand: Eastern Catalytic
Position: Rear
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2005 - Mitsubishi Eclipse Rear L 4 Cyl 2.4L - 2351
Eastern Catalytic
Qty:
$50.29
Eastern Catalytic Catalytic Converter  Rear
  • Federal / EPA Semi-Universal Converter - Standard
  • Undercar Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Standard
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.25" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.25" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology also helps to maintain industry-leading efficiency, productivity, and competitive prices. The proprietary NANO substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency.
Brand: Eastern Catalytic
Position: Rear
Additional Fitment Information:
Vehicle Position Block Engine CID CC
1995 - Mitsubishi 3000GT Rear V 6 Cyl 3.0L 181 2972
Eastern Catalytic
Qty:
$71.13
Eastern Catalytic Catalytic Converter  Rear
  • Federal / EPA Semi-Universal Converter - ECO II
  • Undercar Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Eco Ii
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.25" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.25" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Proprietary ECO II NANO substrate chemistry is designed to be effective on most complex or second-generation on board diagnostics (OBD II) systems and yields highly efficient loadings for lower cost and better converter efficiency. Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology helps to maintain industry-leading efficiency, productivity, and competitive prices.
Brand: Eastern Catalytic
Position: Rear
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2004 - Mitsubishi Eclipse Rear V 6 Cyl 3.0L 181 2972
Eastern Catalytic
Qty:
$50.29
Eastern Catalytic Catalytic Converter
  • Federal / EPA Semi-Universal Converter - Standard
  • Undercar; From 6/92 Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Standard
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.00" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.00" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology also helps to maintain industry-leading efficiency, productivity, and competitive prices. The proprietary NANO substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency.
Brand: Eastern Catalytic
Additional Fitment Information:
Vehicle Block Engine CID CC
1993 - Mitsubishi Montero V 6 Cyl 3.0L 181 2972
Eastern Catalytic
Qty:
$50.29
Eastern Catalytic Catalytic Converter
  • Federal / EPA Semi-Universal Converter - Standard
  • Undercar; From 6/92 to 5/94 Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Standard
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.00" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.00" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology also helps to maintain industry-leading efficiency, productivity, and competitive prices. The proprietary NANO substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency.
Brand: Eastern Catalytic
Additional Fitment Information:
Vehicle Block Engine CID CC
1994 - Mitsubishi Montero V 6 Cyl 3.0L 181 2972
Eastern Catalytic
Qty:
$50.29
Eastern Catalytic Catalytic Converter  Rear
  • Federal / EPA Semi-Universal Converter - Standard
  • Undercar; From 6/00 Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Standard
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.00" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.00" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology also helps to maintain industry-leading efficiency, productivity, and competitive prices. The proprietary NANO substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency.
Brand: Eastern Catalytic
Position: Rear
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2000 - Mitsubishi Galant Rear L 4 Cyl 2.4L - 2351
Eastern Catalytic
Qty:
$71.13
Eastern Catalytic Catalytic Converter  Rear
  • Federal / EPA Semi-Universal Converter - ECO II
  • California Emissions; Undercar Legal Note: Not For Sale or Use in the state of CA/NY & Maine (vehicles with California Emissions)
  • UNIVERSAL
  • Product Attributes:
    • Air Tube Qty: None
    • Body Length (IN): 10"
    • Catalyst Type: Eco Ii
    • Inlet Gasket Qty: None
    • Inlet Hardware: None
    • Inlet Type A: 2.50" Id
    • O2 Sensor Ports: None
    • Outlet Gasket Qty: None
    • Outlet Hardware: None
    • Outlet Type A: 2.50" Id
    • Shape: Oval
    • Test Weight: 5.9 / 6000
  • Proprietary ECO II NANO substrate chemistry is designed to be effective on most complex or second-generation on board diagnostics (OBD II) systems and yields highly efficient loadings for lower cost and better converter efficiency. Latest advanced-manufacturing technology, including automated workstations, spinner welding equipment, and high-speed production lines ensures that all converters are built to exact OE dimensions and fitment. This technology helps to maintain industry-leading efficiency, productivity, and competitive prices.
Brand: Eastern Catalytic
Position: Rear
Additional Fitment Information:
Vehicle Position Block Engine CID CC
2002 - Mitsubishi Diamante Rear V 6 Cyl 3.5L 215 3497

Latest Mitsubishi Repair and Catalytic Converter Installation Advice

CarJunky AutoAdvice

bad catalytic converter errors...please advise me

Showing 8 out of 8 Posts
Question From abstruseoni on bad catalytic converter errors...please advise me

I have a 2004 Mitsubishi Galant with about 110,000 miles. I took it to the shop for a check up only to find out my check engine light is burnt out and I have two engine codes popping up. I think the codes were P0420 and P0422, which the mechanic said was my left and right catalytic converters.. and he said that a dealership would have to fix it because it's a Mitsubishi. the dealerships quoted me (over the phone) about $2,400!!! I've googled catalytic converters and the parts (i'm not 100% which parts i would need to make this the easiest) range from $50-$400..Much cheaper than the dealer. My concerns are, I've read this requires a welder or sawzall, which in it's self is dis-concerning ...and i've read the CATs don't just GO bad, that it's usually from another issue, but i'm not sure what issues to check. plus I don't have a gas analyzer, so i can't even properly diagnose that it's the CATs. and if a mechanic told me I must take it to the dealership, what hope do I have of doing it? am i in over my head? I definitely don't have $2300 to throw at a dealer, but they charge $100 for a full diagnostic which might tell me for sure it's the CATs and might tell me what caused the issue to begin with, but I don't know for sure. Any advice on my situation would be appreciated. Thanks in advance

Ryan

Response From Hammer Time

Your only hope is to take it to a Midas or other exhaust shop. If there is an aftermarket cat available and there might not be, they will have access to it.

Response From abstruseoni

Thanks for the quick reply Hammer. I've googled 04 mitsubishi galant catalytic converters and got only a few results, but i noticed several different parts and kinds ranging from $80 - $500. and most of them show a picture of what looks like the whole exhaust pipe...but they're really only selling the CAT right? I would need to weld their cat onto my exhaust, right? (excuse my ignorance if i'm using the wrong name, i'm not use to this stuff) So wouldn't the CATs i get have to match my current exhaust system, for the most part? how do I know i'm getting the right part?

and could you enlighten me a little on "direct fit" parts? do those not require welding?

Thanks again :)

Response From Hammer Time

You've got the right idea but this is nothing for you to attempt yourself. Take it to an exhaust shop. That's what i did ffor my own vehicle. they are the only ones equipped for this.

Response From abstruseoni

You're right, it probably is too much for me, but I have a friend that's done a few catalytic converters before and he has most the tools we would need. However, I'm taking your advice and monday i'll drop my car off at midas for them give me a full diagnostic and quote me a price. depending on how that goes, i'll either have them do it or try to fix some of it myself. Thanks for all your help

Response From Hammer Time

If you can buy a direct fit "Y" pipe at a reasonable price, then fine but don't attempt to cut and weld that converter in yourself. It's not easy and requires a lot of experience to get it right.

Response From abstruseoni

I took my car to midas and for $30 bucks they were able to tell me what i already knew, lol. I thought they'd have something to check the gas levels and actually be able to tell me for sure that it was my left and right CATs...instead they just checked my computer codes and said it's my CATs for sure. and they told me I currently have OEM parts...oh and said my O2 sensor didn't need to be checked because it would give a code if it was bad... and apparently they charge $1200 for fixing the CATs.

I've got a friend that's done this before, so with his help I think we can replace it, but i'm still not 100% positive what part or parts to get. Here's a list of Galant 04' CATs:

http://www.thepartsbin.com/catalog/?N=9190&Nr=OR%28AND%28make:Mitsubishi,model:Galant,year:2004%29,AND%28universal:1%29%29&Vi=1676+11327+4294962849&y=2004&mk=Mitsubishi&md=Galant can you recommend any parts? I have a V6

the first one is listed as an Eastern Front Manifold Catalytic Converter and it looks like it has both the right and left CATs in it...is that right? or is this a different part completely?

and I was told my car has 3 CATs and that one of them is unmonitored, and since i can't test them individually should i replace them all?

Response From Hammer Time Top Rated Answer

Your codes are for bank 1 which would be the rear pipe.
You can do what you want but I wouldn't touch those parts with a 10 foot pole.
By the way, that 2 year warranty they are giving is not even legal in the US. Converters are required to be warranted for 50K and at least 8 years. You might want to check for warranty coverage on yours if you are the original owner.

DID I GET A LEMON OR IS IT SIMPLE STUFF

Showing 2 out of 2 Posts
Question From Guest on DID I GET A LEMON OR IS IT SIMPLE STUFF

Hi. I just bought a 01 mitsubishi galant v6. When I bought it the guy told me I would need a new catalytic converter. I thought this meant that I couldnt get it inspected. Upon having it for 2 weeks now there are some things that have occurred that I am worried about please help!! First, ywice it has jerked when I pulled off from stop sign. It sounds like it revves then it jerks, but it drives normal. It doesnt shift hard or anything. Second, the driver side front tire sounds like it is popping when I drive over lil bumps or anything like that. Third, it squels really loud when I first cut it on. Please help. I dont have money for a mechanic check up!!And I need this car to keep running. I work full time and go to school full time.marybrinn@hotmail.com

Response From dmac0923 Top Rated Answer

you need to provide more information about the car, like mileage and any know last service information

but heres throwing some ideas at ya

the popping noise in the tire and the jerking on take off could be related in that is more then likely something worn out in your front suspension. ball joints, struts or CV joints.

the squealing is probably just a bad serpentine belt.

catalytic converters can be rather expensive to just throw at a car if they arent needed. more times then not there will be a check engine light or severe performance loss when a catalytic converter goes bad.

2000 Mit Diamante codes 0173, 0170 & 0421

Showing 2 out of 13 Posts | Show 11 Hidden Posts
Question From comnavguy on 2000 Mit Diamante codes 0173, 0170 & 0421

This 2000 Mitsubishi Diamante with 137K miles won't pass inspection.

Code P0170 fuel trim malfunction Bank 1
Code P0173 fuel trim malfunction Bank 2
Code P0421 warm up catalyst below threshold Bank 1

What is this, and what repairs are required?

Thanks.

Response From Hammer Time

Your probably going to need a scan tool here. The codes are pretty generic and only indicate that the fuel is either too far rich or too far lean. It doesn't tell you which so you have to determine that with the scan data. You also have to look at all the sensor data for a cause like the temp sensors both intake and coolant, MAF and the MAP sensor.

The 421 is probably an early sign of a failing converter.

Response From comnavguy

I hope this is not a duplicate. I was composing a reply and the space went blank except for a few words???

It was: Tell me about a scan tool. Who is most likely to have one?

And, what is bank 1 and bank 2 on a single exhaust vs a dual exhaust car; single catalytic converter vs two ?

Response From Hammer Time

A scan tool is a basic computer interface tool. Most shops have one. Bank one will be the side of the engine where #1 cylinder is.

Response From comnavguy Top Rated Answer

Will this scan tool tell us exactly which sensor is bad and if the catalytic converter is bad or not?

How can the O2 sensors be tested?

Response From Sidom

Like HT mentioned, this one would require a scanner and you would have to be able to interpret the fuel trims that could cause them to go out of range..... Normally you'll get P0171 & P0174 or P0172 & P0175 codes, the 1st are lean bank codes & latter, rich bank codes, these ones don't even break that down for you. The banks refer to each side of the engine. A 4 cyl will only have bank 1.

So right now you don't know if you have lean codes or rich codes...... 1st step would be to look at the fuel trims and find out.....positive trims would be lean, negative trims, rich...... Lean codes could be be your air intake tube from the air cleaner off, hose off, split in it, it could have a vacuum leak, exhaust leak, all that stuff you could do a visual on. HT mentioned a few things that could set rich codes.....

With those codes, there is just too many things it could be, it needs to be narrowed way down..........But like I said, do a basic look over & look for something obviously broken, off, or hissing noise (vacuum leak)


Damn dude.....How many cars do you have..............lol

Response From comnavguy

I DO have an Actron CP 9180, and have scanned this vehicle. But what oh what does it all mean?

ST FTRM1 14% (Short term-fuel trim ratio bank1)

LT FTRM1 12.5% (long term-fuel trim. Air to fuel ratio bank 1)

ST FTRM2 11.7%

LT FTRM2 12.5%

O2S11 .14 Volts to .74 volts

O2S12 .06 V to .32 volts

and there are lots of other readings which mean just as much to me.

Translation, PLEASE?

As for all the cars...I am retired and one of my neighbors caught me working on my car one day, asked me if I could help him, and it's snowballed from there. I am the go-to-guy for friends and neighbors with "problem" cars. Sometimes it's fun and keeps me out of the street. I'm down to 2 personal cars, just having sold an 89 Olds, 92 Merc and a 91 Sedan DeVille.

Thanks and Happy and safe 4th

Response From Sidom

As HT said those don't look to bad at all, skewed slightly lean but not to bad but both banks are towards the lean side....

Before you clear the codes, do you have access to freeze frame data? If so post that up.

Get someone to drive for you and go for a spin. See what the trims do at high speed, see if they get closer to the zero or single digit range...


Yea working in the driveway can always be a hazard.......

Personally I always try to set something on fire every so often, beat stuff with a big hammer, cuss uncontrollably and every so often chase one of the grandkids around with a ratchet....
For some reason, neighbors requesting advise or repairs really isn't a problem for me......

Response From comnavguy

My scan does have a freeze function. Tonight I'll try to run the tests suggested, freeze the data and post it.

Where and how does one adjust the trim functions with the computer actually doing the trimming? I'll have this car tonight for long enough to run it through some paces - highway and surface streets.

Thanks for the help so far.

Hope you guys had as good a 4th as I.

Response From Hammer Time

That's not what he was referring to. Most scan tools will freeze frame all the sensor data at the moment a code was set and store it for later use so the tech can see what was going on when the code set.

Response From comnavguy

The owner has put this car and problem on the back burner. The car is parked until she gets some money.

When she gets the money, we are going to do more troubleshooting.

Thanks for the help so far.

Response From Hammer Time

Your fuel trims aren't really out of the norm as the code would have us expecting. You might want to clear out all the codes and drive the car and watch what those fuel trim reading do. See if they start a trend going positive or negative and whether it sets the codes again. It may take more than one trip to set the codes.

You have a long term trim and a short term trim for both banks. Those readings are telling you just how much the computer has had to adapt to conditions in the engine so your watching for the computer having to work to overcome something either too rich or too lean, depending which direction those readings are moving. Right now yours are slightly positive on both banks but well within the range of adjustment and staying fairly even.

Response From Hammer Time

LOL............ no

2000 Mitsubishi Montero Sport 3.6L 4WD won't run for more than a few minutes - ??catalytic converter failure??

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Question From jtmill02 on 2000 Mitsubishi Montero Sport 3.6L 4WD won't run for more than a few minutes - ??catalytic converter failure??

upon leaving work on sunday night, got to my 2000 Mitsu Montero Sport 3.6L 4WD and realized i had left my lights on (recurrent bad habit) and the battery was DEAD. had a friend right there who was happy to give a jumpstart. in a hurry to get home, i carelessly crossed the cables. after realizing the problem, i successfully started the car but it quickly died 30 seconds after the cables were disconnected. figured i had fried the alternator and got the car towed to my dealer.

here's where it gets funny. dealer checks it out yesterday and confirmed the alternator was shot as well as the battery. replaced both as well as a couple of fuses that were also blown. but when they started the car and let it idle, after several minutes the engine began to sputter and subsequently stopped running. after sitting for a while, it would start and run fine, but then after a couple more minutes stop. based on the way it was running, the tech felt like it was a problem with blocked exhaust. he removed the oxygen sensor in front of the catalytic converter, which supposedly allowed air to escape and the engine ran fine. replacing the sensor almost immediately killed the engine. this led him to believe the catalytic converter was bad, and that as it got hot it was clogging(swelling?) up, obstructing the exhaust.

some of this was communicated to me over the phone, and my initial impression was that it was just running like normal and somebody was just overly sensitive to some rattle or something. of note, it had been running very well before all this. when i got to the dealer, i pulled the car around from where they had parked it up to the service desk to settle up - it ran great for that brief (~30 second) drive. they explained the above to me and recommended that i leave it with them to get their exhaust guys to replace the part. i still didn't quite understand and decided to take my chances.

everything seemed great for about three or four minutes. then it happened. while idling in traffic just in front of the dealer, the engine stalled and died within 5 seconds. i was able to get it off the road and sat for a couple of minutes. it started back up and i drove in the shoulder for about another 50 yards before it died again. after a couple more minutes, i started it back up.

here's where it got funny again. when i started it for the second time, i decided to floor the accelerator to see what would happen. interestingly enough, by doing this, it would sputter but not die. on the trip back through the auto mall (~1/2 mile) it didn't die again, but would sputter for 20 seconds, creeping along at a very low speed, then surprisingly get full power again for about 10 seconds before starting to sputter again. this pattern went on until i made it back to the dealer.

so as of right now, they are confident in the problem being the catalytic converter but without an explanation of why it failed all of a sudden. it is going to an exhaust shop tomorrow where they will run their own diagnostics before possibly replacing it for around $600.

my concerns are:
- my gut tells me that it's not the catalytic converter, rather something electrical. electrical problems are clearly explainable, and the car was running great prior to my bonehead error. i'm afraid of dropping $600 unnecessarily and then starting all over to find the real problem.

- why would the converter fail?? my understanding is that the converters don't really fail on their own, they have to be fouled by fuel rich exhaust burning hot or by some contaminant. my first thought was that if the electrical were shot, possibly there were some timing or sparking problems that led to fuel rich exhaust doing thermal damage to the catalytic converter. one of the guys gave some BS postulation about the fuel formulation used here in KY and that they have been seeing a ton of failed converters - this might explain a chronic failure, but clearly something has happened since sunday.

- if the catalytic converter is bad due to an unexplainable cause which may or may not still be present, what's to keep if from failing again?

- does a failed catalytic converter actually behave this way? i would think you would have problems as soon as the car is started. the explanation that the converter was getting hot and clogging once the engine had been running doesn't make a lot of sense to me, but i don't really have any knowledge base in this area.

of note, the computer had no error codes at any point during this fiasco. also, i bought the car from this dealer and have dealt with them for 11 years. same service manager, and thus far have never had any problems or felt gouged by them.

any input would be greatly appreciated.

thanks in advance,
jason

Response From Discretesignals

Usually if a catalyst is clogged to the point the engine won't run, it won't all the sudden unclog itself. It would be a first for me to hear of a catalyst being clogged only when warmed up.

To verify a restricted exhaust the best way is to screw a back pressure gauge in the O2 sensor hole before the cat. When the engine is running the pressure shouldn't be anymore than 3 psi at 2000 rpm. It might have been a coincidence the engine ran with the O2 sensor out. Did he unplug the O2 sensor connector to see if the engine ran better with the O2 sensor screwed into the exhaust?

Crossed battery connections might of nailed your engine controller or any other solid state device in the electrical system. The problem really needs to be diagnosed again to see what is actually missing when the engine doesn't start after it has stalled.

Response From jtmill02


Usually if a catalyst is clogged to the point the engine won't run, it won't all the sudden unclog itself. It would be a first for me to hear of a catalyst being clogged only when warmed up.

To verify a restricted exhaust the best way is to screw a back pressure gauge in the O2 sensor hole before the cat. When the engine is running the pressure shouldn't be anymore than 3 psi at 2000 rpm. It might have been a coincidence the engine ran with the O2 sensor out. Did he unplug the O2 sensor connector to see if the engine ran better with the O2 sensor screwed into the exhaust?

Crossed battery connections might of nailed your engine controller or any other solid state device in the electrical system. The problem really needs to be diagnosed again to see what is actually missing when the engine doesn't start after it has stalled.


I'll make sure to ask about the back pressure when I talk with the exhaust guys tomorrow.

I don't think he disconnected the O2 sensor connector, he just unscrewed the sensor from it's hole. (I'm not sure I understand your question correctly, so please let me know if this doesn't make sense - I assume that you mean the hole would be plugged by the sensor but no information getting back to the computer because the cable was disconnected from the sensor.)

I didn't get a clear explanation of why he took the O2 sensor off - my understanding is that he already thought it was an exhaust restriction, so he took off the sensor to relieve the pressure and he says it ran normally once the sensor hole was open.

They seemed set on this catalytic converter solution and were reluctant to go after more electrical/timing/fuel mix problems because there were no error codes to indicate any problems. Is it possible that the lack of computer error codes could be a result of damage to the computer? If yes, how do figure that out?

Response From jtmill02

UPDATE - Car went to exhaust shop yesterday morning. They quickly ruled out the catalytic converter as the problem - all the exhaust testing was fine. Back to the dealer, where they apparently spent a good part of the day trying to figure out the problem. They finally decided the problem is a fried fuel pump control module. This makes more sense to me given the mechanism of damage, so I was satisfied with the explanation, even though I don't have any idea what a bad fuel pump control module would act like. The part will take a couple days to come in but will cost half of what replacing the cat would.

Thanks for everyone's input. I'll update when the part gets replaced.

Response From Hammer Time Top Rated Answer

My gut is agreeing with your gut. It's not acting like a plugged Cat and appears electrical but the only way you are going to find out is by doing some testing during that period when it won't start. You need to test for spark, injector pulse and fuel pressure to isolate the cause.

Response From jtmill02


My gut is agreeing with your gut. It's not acting like a plugged Cat and appears electrical but the only way you are going to find out is by doing some testing during that period when it won't start. You need to test for spark, injector pulse and fuel pressure to isolate the cause.



To clarify, I'm not sure that it wouldn't start again right after it died. The technician told me it would run again after sitting for a few minutes and that's what I did - I didn't attempt to start it earlier and it did start right away after sitting.

I did ask about the some of those issues, but they told me that there were no computer error codes so they didn't look further into it.