2001 Pontiac Grand Am 2.2L Ecotec.

Question : My Pontiac has the check engine light on. I had the a scan of the codes from Autozone and the mechanic said it was P0171 lean exhaust system. The traction control light is also on the dash. He said the code could have also set the traction lights. Car seems to run and idle good.

Starts up just fine all the time. What is a common cause for this problem? Can it be something i can fix my car myself. My boyfriend has tools and can do some work and maintenance. Thanks for any help.



Answer: Actually, a P0171 code is a Fuel Trim Lean code. The engine is getting more air than fuel which causes a lean condition and will set the code. A vacuum line that has come loose can cause this, or not having an air filter installed, or possibly the duct work to the throttle body has come detached. Those are some quick fixes and can be checked easily. Other things that are a bit more involved to check would be a fuel injector that is clogged, fuel filter that is clogged, or even a fuel pump that isn't putting out as much fuel as it should. Those would need checked by someone experienced and preferably someone that has a scanner that can watch the data stream and fuel trim levels. Another possibility is a faulty oxygen sensor. I would check for vacuum leaks first, as that's usually the cause.


More Auto Repair Help


Be Social With Us !

Leave your comments

Post comment as a guest

0
    • No comments yet.

    Latest Articles

    2006 Pontiac Montana Tailgate ...

    Problem with my 2006 Pontiac Montana Miniva. 3400 V6.What ...

    Knock Noise In Front End Of ...

    Question: long story short. Due to a wrong diagnosis my ...

    Chevy Malibu Theft Problems ...

    Name : Joe K.My story is about a 2001 Chevy Malibu. For the ...

    How to Replace 2001 Chevy ...

    {loadposition embed} Chevy Malibu 2001.3400 V6 ...

    How Things Work

    Car and Truck Fuel System Operation

    The fuel tank stores the fuel supply. The electric fuel pump, supplies fuel through an in-line fuel filter to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pressure regulator maintains the correct fuel pressure to the fuel injection system. A separate pipe returns unused fuel to the fuel tank.

    Read more...

    Common Engine Codes

    P0108 MAP Sensor Description and Repair

    The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:

    Read more...