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How to fix a 2000 mercury cougar with a cumputer code reading fuel trim too lean (bank2)

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POSSBLE CAUSES FOR LEAN FUEL TRIM.STOPPED UP FUEL FILTER OR STOPPED UP FUEL INJECTORS.WEAK FAULTY FUEL PUMP.FUEL PRESSURE SHOULD BE 37 - 41 PSI.YOU COULD HAVE AIR LEAKS AFTER THE MAF SENSOR OR LEAKS IN THE PCV SYSTEM.CHECK FOR A EXHAUST LEAK NEAR THE OXYGEN SENSOR.LEAKING EGR VALVE GASKET OR VALVE DIAPHRAGM.MAF SENSOR DIRTY.UPSETTING AIRFLOW CONFUSING THE PCM.

Posted on Oct 09, 2010

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What is the fix for a code p0171 problem


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