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Old 08-29-2012, 06:22 PM   #1
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Join Date: Aug 2012
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Cool codes p0171 and p0174

What is causing these codes? is it cheap gas or are my oxygen sensors going bad?
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Old 12-08-2015, 11:26 PM   #2
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Location: Roy, Wa. 98580
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replace the MAF sensor..
both codes indicate lean condition on each bank.
P0171= lean bank 1
p0174 = lean bank 2
of course you should check for vacuum leaks first.
do you have any running issues ?? poor idle or flat spots in throttle response ?
try unplugging the MAF, if idle smooths out, change the MAF..
of course you should check for vacuum leaks first.
Did you change your air cleaner to a new type or brand ?
some times if an air cleaner flows more or less air than the one it was tuned with, it can cause this.
hope this helps
it's a start.
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