Question about 1999 Chevrolet Silverado 1500
Oxygen sensor failure
P0171 System too Lean (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0174 System too Lean (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
hope this is a bit of a push in the right direction ...
Posted on Feb 04, 2010
1999 Chevrolet Silverado 5.3L keeps giving codes 171, 174 so we replaced all the O2 sensors still won't run right, then we replaced the mass air sensor, then the map sensor, and still it gives me the same codes over and over and will not run right. It was running down the freeway just fine and then this just started out of the blue with the lean bank in 1 and 2, there is nothing more to replace, and it does not set the code sitting in place and revving the engine, it only acts up when driving or under a load persay. I have been throught the entire fuel management system and replaced every part, so can you please tell which .22 cent part I missed that is causing all this grief to the tune of over 450.00. mjw
Posted on Mar 23, 2010
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Posted on Jan 02, 2017
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