Question about 2002 GMC Yukon Denali
SES light is on and the pcm codes of P0171 and P0174 popped up on the OBDII. Replaced the MAF sensor, reset the the PCM and drove it. Sure enough the SES light came back on. Tested and the same two codes pop up. Whats next? 2002 GMC Yukon denali
ARun some good fuel injector cleaner through it. If not that you have vacum leak. Lucas fuel injector cleaner.
Posted on Dec 20, 2012
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Posted on Jan 02, 2017
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