Question about 2004 Chevrolet Impala
I have replaced pvc valve cleaned throttle body and mass airflow sensor
Code p0171 refers to system too lean, bank 1===causes --intake/exhaust leak --AIR system---MAF/VAF sensors--fuel pressure/pump--injectors---HO2S sensor
as the HO2S sensor is the first sensor to inform the ECM of the mixture setting problem I would consider changing it first. Have the fuel pressure checked as there may be a problem with the pressure regulator in the manifold and lastly have the injectors checked for tip blockages.
Posted on Nov 23, 2014
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Posted on Jan 02, 2017
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