I was just wondering if anyone has obx stainless steel headers and cat back exhaust, on there maxima? Because i have had them on my car for about 4 years now and i was wondering if anyone has had any problems with their check engine light being on because of them? Mine comes on, and i scanned it and it says that my o2 sensor is creating back pressure from the cat. I have have a high flow cat. I was just wondering if any one has experienced this. Other than my check engine light coming on once in a while my car runs great!

 

Your O2 sensor is creating backpressure from the converter? What? There is no such code.

What is the exact code?

 

I don't know it off hand, when my check engine light goes on again i will write down the code and let you know.

 

There's no backpressure sensor on an A32 (or most vehicles short of diesels), so definitely record the code.

 

From when i am remembering when the check engine light comes on the code is p0420. and there is not exhaust leak on the car.

 

Test the rear O2 sensor.

It also could be because of the HFC.

 

I check the o2 censor and replace it if necessary and or clean it if necessary, but do you think that a straight pipe will eliminate this problem and be OK for emissions?