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What would cause a code of p171 and p174 , which is bank 1&2 running too lean .

(1999 Chevrolet Silverado 1500)
in Benton, AR on November 14, 2014
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Popular Answer
on November 15, 2014
This applies to both codes... Also note any applicable service bulletin's:
http://engine-codes.com/p0171_chevrolet.html

**Now you should see why guessing at it does not help!!**
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