View Full Version : P0171 Bank 1 Lean

12-14-05, 08:52 PM
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.



12-29-05, 09:45 PM
OK, well, just so I'm contributing... it turned out to be the MAF sensor.

01-03-06, 12:03 AM
OK, well, just so I'm contributing... it turned out to be the MAF sensor.

How did you find out it was the MAF?

01-03-06, 02:34 AM
There should be an accompanying code when the MAF is faulty.

01-03-06, 03:46 PM
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.

01-03-06, 09:18 PM
Well, when my MAF went out, I got a code. I guess I was lucky.

01-04-06, 10:45 AM
Allen what code did you get when your maf went out.

01-04-06, 09:31 PM
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.