Question about 2003 Pontiac Grand Am

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Getting code p0171, can anyone give me an idea what the problem coould be? I'm thinking o2 sensor.

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It means the system is running too lean. You may have a manifold leak, or something along that area. It would have to be diagnosed to determine why it is running too lean. Not something you can just guess at. You need to look at the information on the scanner and compare it to the base for that motor in order to determine if there is a sensor that is out, or something mechanical like an intake gasket. (For instance I would be watching the fuel trim on the scanner while someone sprays carb cleaner around the intake and vacuum lines and watch for the lean number go to rich when you come to the leak. sometimes it is just a crack in a vacuum line.

Hope this helps.

Posted on Sep 06, 2009

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These are all O2 sensor trouble codes, except P0171 which is a fuel trim code,

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