Question about 1997 Chevrolet Lumina
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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Posted on Jan 02, 2017
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PO171 OBD2 Code basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes.
his code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.
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