Question about 1997 Chevrolet Lumina

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I have 2 codes on 3.1 GM 1997 First code is PO171, Second is PO300

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P0171: System too lean (bank one)
P0300: Random multiple mis-fire detected
The first code may be the cause of the second. The bank one O2 sensor (and the bank two may not be far behind) may be about worn out (lots of miles and never changed?) Have you had fresh spark plugs and wiring lately? Most of the other sensors affect the entire engine. Try running some injector cleaner with a tank of gas.

Posted on Nov 18, 2009

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