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My engine light came on and the obd said it was the heat o2 sensor in my 2003 pontiac aztek. I have no idea where it is located or how to replace it...any help???;

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This explains what it is and where to find it (generally)

Basically it is attached to the exhaust system of your truck and reads how the engine is burning the fuel...the truck must have a heated o2 system which has a heating element in it (has nothing to do with your heater or cooling system...)

I usually buy my car parts on if you go there you can search for the part for your car and get an idea what it looks like and a price...

Posted on Oct 30, 2012


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Posted on Jan 02, 2017

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SOURCE: Where is o2 sensor 1 located on a 2002 aztek any

Which one? Your vehicle is equipped with 2. One is in the exhaust manifold on the left bank and the other is in the exhaust pipe after the catalytic converter.

NOTE: Most O2 sensor codes do not mean that the O2 sensor should be replaced. Most of the time, the O2 sensor is only reporting the failure of one of the other system components. To save time and money, I personally recommend having the vehicle diagnosed by a qualified service technician. I have seen many people spend hundreds of dollars on O2 sensors only to find out that the problem was caused by something else. Case in point: One man spent nearly $500 replacing all 4 of the O2 sensors on his Ford F-150 Pickup only to have the O2 Sensor code return 2 days later. He brought the vehicle to me and I fixed it with 50 Cents worth of vacuum tubing. O2 sensors do fail, but about 70% of all the O2 sensors that get replaced do not fix the problem that caused the O2 Sensor fault code. Fault codes Never tell you what parts to replace. They only tell you which of the many parameters monitored by the computer is out of specification. Proper diagnosis is required to find out why.

Posted on Jan 15, 2011

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SOURCE: 2003 Ford Ranger/2.3 O2 sensor - How many and Where located ???

Engine Heated oxygen and catalyst monitor sensors—2.3L engine44e2701.jpg

Posted on Jan 16, 2009

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SOURCE: Where is the O2 Sensor located on 2003 Ford Focus?

The code will tell you which O2 sensor it is.
The code will point to either bank 1 sensor 1; bank 1 sensor 2; bank 2 sensor 1; bank 2 sensor 2.

From what I remember with a focus, it should only have 2 sensors, sensor 1 will be located before the cat, and sensor 2 will be located after the cat.

Posted on Oct 08, 2009

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SOURCE: Engine light came on,used code reader OBD 2 and

Bank 2 sensor 2

Engine's driver side o2 sensor after the Catalytic converter.

Posted on Jan 23, 2010

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SOURCE: check engine light on 2003 toyota tacoma, O2 sensor?

An O2 sensor code is a tricky one. It could mean SEVERAL different things, and I know how bad it sucks to hear this, but your best bet is to take it in and have a diagnostic ran on it at either a dealer or a good mechanic shop with a computer they can hook up to it. I had an "O2" code come up a while back on another car I used to have, and literally spent weeks and hundreds of dollars trying to fix it, and never did. Finally out of desperation took it in, paid the $90, and they found the problem and fixed it in like 30 minutes. Something I would have never even thought of was causing it (can't remember off the top of my head). After that I stopped wating time and money on check engine lights. One comes on in my car, I take it to have it ran for free at and auto parts store just to make sure it's not a loose gas cap or something, just to get an idea of what I'm looking at, then go and make an appointment to have to hooked up to a diagnostic computer to track down the problem. Good luck, and hope this helps save you some time and money.

Posted on Apr 05, 2010

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The sensor two is the one located after the catalytic converter. While sensor one is always the O2 sensor located on the engine side.

Bankone refer to the sensor located in line with cylinder number one (theone that is sparking first i order). The firing order on Pontiac Atzec is as follows:

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Thanks for choosing Fixya!

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