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I have an 01 Catera and about 3 weeks ago I got the check engine light. Took it to Autozone and they pulled it as P0171. I had them reset it and it's been running fine. Today, I had the same thing happen. I'm thinking one of the O2 sensors maybe, but which one? Any help?

Runs fine when cold and warmed up.

Thanks!

Greg
 

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no Allen alot of the time when maf goes out only codes you will get are miss fire codes with a few other codes but not one saying to chack maf.
 

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If I am not mistaken its one of the P0100 variation. It's not exactly P0100 because if I am not mistaken that code means that the MAF is not giving any reading. What i got is saying something like the reading that the MAF sensor is giving out is inaccurate. And in my analysis it's probably correct because, I had the MAF sensor checked by a friend of mine with a TECH 2 scanner and he said that the MAF sensor is working and is actually giving out readings. I thought that the readings are out of whack that is why i am getting rich mixture at the Oxygen sensors.
 
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