Shop Mazda Oxygen Sensors

Year: 2001
Make: Mazda
Model: Protege
Engine size: 1.6L
110,000km

The car is getting about 60km on a quarter tank of gas, which is very bad. I have the same car, one year older, that gets 150kms to a quarter tank. The car runs totally smooth.

We have done some research and found that most times a P1170 code means bad front oxygen sensor.

I have made a video of the voltage that the oxygen sensor outputs when going through revving cycles.

Apparently normal working sensors output 0.45-0.5v when at idle. When car accelerates, it goes up to 0.9v, and down to 0.1v during deceleration. Do these erratic readings mean the oxygen sensor is gone bad? Also, the oxygen sensor reads 0.112v when the engine is OFF.

Here is the link to the video:

No, that's not how a working 0/2 sensor reads. It reads low until it gets heated up and once it;s up to temp it's supposed to constantly cross count from real low to real high and back again. The more frequently it ranges, the better it is working.

Any idea what could be causing my bad mileage then? Let me remind you the car runs VERY good, better than my older one does.
I have other research saying it could be either a clogged EGR valve, or misreading MAF. But the car sucks in air quite good.

The car has a lot of power. Sometimes I get a funny smell when I run her through to 6,000rpm, and then park it. Kind of like sulfur, but not really. Almost smells like unburnt fuel.

Why don't you replace the sensor and find out.

Why don't you replace the sensor and find out

But isn't my sensor running like normal?

Would a bad O2 sensor cause rough idle?

I remember my old Protege had a problem with the rear O2 sensor, and that caused all sorts of issues. It would stall, hesitate, lose power, etc.

No and No.............Didn't I just explain that to you.

No and No.............Didn't I just explain that to you.

Whoops sorry! Read your first reply wrong.

I'll go and replace the O2 sensor tomorrow.

Thanks for the confirmation :)

1996 mazda 626, i recently bought this car and need some help. when the car is put in park it dies immediatley, and while stopped idols extremely rough, on acceleration it acts like it is going to die then will accelerate quickly. do you think this could be the oxygen sensor. once the car is running it is fine. the check engine light is on

you will need to get the codes pulled and post them here

I have a 1999 Mazda 626 ES V6, auto trans, FWD, and 91K miles on it. I have the Check Engine light on since a few weeks.

I have the following error codes using OBDII tool
P0133 - Heated oxygen sensor H02S RF circuit malfunction

P1131 - Heated Oxygen sensor Bank1, sensor1 (H02S11)

P0040 - EGR system leak detected

The car starts, and runs fine, no strange noises, or stuttering. Recently, I had the fuel pump replaced. Gas lid is closed tightly.

I would appreciate if someone could help me get a rough estimate for repairs. I'm trying to make a decision whether to get the repairs done or get a replacement car. Thanks very much!

Thanks for the reply, Tom! I appreciate it. I will give it a try.

2006
Mazda
Protoge
2 l ES
279912

A lot of black smoke comes out of the tail pipe.
Engine oil is lost.
I tried to get a read out with my OBD2 Car reader, but no fault code is noted.
Misfire Monitor, Fuel System Monitor, Comprohensive Component Monitor are steady.
Catalyst Monitor, Evaporative System Monitor, Oxygen Sensor Monitor, Oxygen Sensor Heater Monitor and Exhaust Gas Recirculating Monitor are flashing during the testing.
Could it be, that the OBD2 does not work on the Mazda. It works well no my 97 Sable and 2000 Taurus.
Any of your comments would be greatly appreciated.
Regards,
Otto Doering

How much oil did it lose? You might want to find out where the oil is going or is leaking from.

Black smoke usually means the engine is burning too much fuel. You need to think of things that would make an engine run rich. You really need scan tool data to see how the engine computer is controlling fuel and what the inputs look like.

Has there been any recent work done before this happened?

Dealer told me my oxygen sensor was faulty on my Mazda B2300 and that there are 2 sensors on my truck, a precat and postcat and the price to change they gave me was very high. I bought the Walker Sensors online and installed them myself and the truck still runs great but, the check engine light is still on. How do you clear the light? Thanks.

Please post year, engine size, mileage. It is all listed in the first post in this sub-forum. Thanks. OBD I and OBDII are different. We need information to give you information.