OBD codes
December 8th, 2009, 7:52 AM
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OBD codes
03 silverado Z71 5.3 4x4 200,000. she is throwing a couple of codes. i have the codes and know what they mean, but need to know how to fix.
P0430 cat, below threshhold, bank 2.
P0171 system to lean bank 1 and 2.
any help in where to start would be appreciated. thanks
P0430 cat, below threshhold, bank 2.
P0171 system to lean bank 1 and 2.
any help in where to start would be appreciated. thanks
Last edited by jameseroot; December 8th, 2009 at 9:39 AM. Reason: adding signature
December 8th, 2009, 6:10 PM
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system too lean on both banks usually means feul delivery problem, first place to start would be a new fuel filter and clear the codes. If the problem persists then check your fuel pressure, could be a fuel pump going. About the catalyst, hope the fuel issue resolves both of the codes because then your looking at replacing the cat.
December 8th, 2009, 9:34 PM
#4
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On the 5.3 most likely you need intake gaskets. Fix the codes for lean first if the other comes back you need a cat. PO171 is system too lean bank 1 sensor 1 PO 174 is system too lean bank 2 sensor 1Did you have a PO174 also?
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