Error Codes P0171 and P0174
Lead Lap
Joined: Feb 2008
Posts: 546
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From: california
Both are lean errors, with the P0171 being among the most common of all CELS, here is my list:
injector blockage
dirty air filter (that is a big one)
dirty PVC filter
IACV blockage
gas cap
Exhaust pipe leak (right around the manifolds off the engine block, usally a hairline crack can be seen
and finally though probably lesser so, A/F sensors (this can be checked by a mechanic with an advanced scanner...need not be Lexus/Toyota, but they can read both banks 1 and 2)
injector blockage
dirty air filter (that is a big one)
dirty PVC filter
IACV blockage
gas cap
Exhaust pipe leak (right around the manifolds off the engine block, usally a hairline crack can be seen
and finally though probably lesser so, A/F sensors (this can be checked by a mechanic with an advanced scanner...need not be Lexus/Toyota, but they can read both banks 1 and 2)
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