Yes hello there I hear everybody talking about how much O2 sensors cost and it's crazy I just purchased one two days ago at AutoZone for $58.95 that was for Bank One O2 sensor I had a shop right down the street that I know very well install it for 30 bucks here's a good bad news my light is still on and now I'm still trying to figure out what it is but O2 sensors are not that expensive thank you

 

Bank one upper or lower? There are two on each bank.

 

Excuse me Bank One

 

If you bought cheap O2 sensors at Autozone and still "have a light", the first question to ask is this: What are the code(s) now versus what were the codes before?
If all you are doing it changing parts, you will be working on this a long time - the only way to "figure it out" is to take in all information: symptoms, codes before, codes after, parts changed, history of issues with the car, etc.

I had multiple O2 codes on the Graphite - replacement of plugs and wires cleared everything right up. SOME O2 codes CLEARLY indicate a bad O2 sensor, many indicate a mixture, ignition, intake or manifold problem.


And this is not an introductory post.
Thread moved to appropriate forum.

 

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A good read is any reputable explanation of what an OBD-II tester does, what the codes mean, and the fact that it is showing a system OR systems that can cause the triggered code(s). Further diagnosis usually narrows down what part is misbehaving BUT (just as an example) a DTC for an oxygen sensor doesn't mean the sensor is bad. It means for some reason the values are as defined for that DTC and system. Your task is to determine if it is in fact a bad sensor, or the myriad of other things associated with why the sensor is showing what it's DTC indicates. Newer cars (with all them damn computers) can show a lot more information on a newer OBD-II reader, quite possibly exactly what component failed and why. Many backyard mechanics (and I use that term loosely) just throw parts at it (called shotgun diagnosis) because they have neither the tools or time to delve into why a DTC is coming up or returning. This usually results in a huge repair bill by throwing parts at it until it behaves (sound familiar, stealership mechanics may be guilty of this). Good luck!


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