DerrickG said:Ok guys have an 2006 Envoy Denali and I have two codes for the engine light. P0171 and P0174 Bank 1 and 2 too lean. Whats causing this? Is there a common issue? It runs and drives fine so not sure whats going on. Thanks!!
Denali n DOO said:I had those codes too, might be time for a lil cleaning, have a read http://gmtnation.com/f26/p0171-p0174-morning-6587/
DerrickG said:Well crap... the wife said it came back on this mornig. Guess Ill do a deep clean on her tonight. Any other things I should try?
chicagotransam said:Did you check the intake tract? Anything after the MAF that has come loose or otherwise leaking air into the motor will cause this code.
chicagotransam said:A faulty MAF could cause it too I suppose. I hope that is it. Let us know how it goes
chicagotransam said:FWIW, it's not about the year. My 05 has a MAF because all the 5.3s did.