Quote:
Originally Posted by Qcksilver
one more thing i've noticed with mine that i forgot to add yesterday. my Trac Off light that's under the Check Engine light has been coming on also. and sometimes it doesn't want to go out even though i've pushed the button next to the shifter. from time to time it goes out on it's own. not sure if it has anything to do with my problem but the two lights seem to have come on around the same time.
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The same thing used to happen to me... with the same P0171 code... it occurred immediately after I installed my narrowband air/fuel ratio gauge and tapped into the O2 sensor's wires. Ever since I disconnected that gauge, it's never happened.
Sounds to me like a vacuum leak; you're getting unmetered air in somewhere.