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Check Engine Soon Light
CHECK ENGINE LIGHT IS ON
2005 Toyota Corolla
January, 14, 2010 AT 9:38 AM
Engine Performance problem
2005 Toyota Corolla 4 cyl Front Wheel Drive Automatic 77000 miles
scan code is P0171 - system too lean. What does that mean? Do I need to replace the O2 sensor, or is it something else?
FOUND 17084 RELATED QUESTIONS
Check Engine Light 25,26, And 71.
Service Engine Light And O/d Off Light B
January, 15, 2010 AT 10:06 AM
The upstream O2 sensor is reading a lean fuel mixture, this could be an O2 sensor, clogged injector, low fuel pressure.
I would replace the O2 sensor, erase code. If code reappears, then measure fuel pressure with mechanical gauge to start.
I would also add a can of SeaFoam after changing O2 sensor to gas tank.
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