Question about 2004 Chevrolet TrailBlazer

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I have trail blazer 2004 and i have( engin light )

With fuel trim bank 1 any help?

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  • watn_3mri Jun 23, 2009

    the code is po 171 and i changed the O2 sensor the problem is the same i have been told to chaneged the fuel pump due a fuel dilevary hardnees

  • watn_3mri Jun 24, 2009

    i have done 120000 mile. where can i find (MAF) sensor ? if it work i will know you

  • jaybyrdn91 May 11, 2010

    MAF sensor located in intake tube.

  • jaybyrdn91 May 11, 2010

    Before changing fuel pump... try cleaning your Mass Airflow Sensor (MAF) sensor. Sometimes this sensor will become dirty and it can cause the sensor to send a signal back to the ECM that states it is too lean. Use brake clean and spray inside the sensor. Use compressed air (very slight pressure) after you spray the brake clean on it. Fuel pumps are very costly. Before I would spend the money on one I would hook a fuel pressure guage on and monitor the fuel pressure if cleaning the MAF sensor doesn't work. Also... check for vacuum leaks. Vacuum leaks downstream of the MAF sensor cause a lean condition inside the combustion chamber resulting in the P0171 code you have. How many miles do you have on your trailblazer?

  • jaybyrdn91 May 11, 2010

    What is the code? It sounds to be bank 1 O2 sensor #1.

  • dgnoid May 11, 2010

    Usual cause on this model is a bad oxygen sensor.1



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Fuel could be an issue, although it is not that common on these. You should check for a restricted fuel filter first before changing pump.

Posted on Jun 23, 2009


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