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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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