Question about 1997 Ford Escort
DTC P1131 indicates the FUEL INJECTION system is correcting RICH for an overly LEAN fuel condition. The Heated Oxygen Sensor (HO2S) voltage is less than 0.45 volts. This is usually due to a vacuum leak after the MAF (mass airflow sensor). It can also be caused by a bad PCV valve or PCV (positive crankcase ventalation) system hose that leaks, also get a can of spray carburetor cleaner and spray the intake manifold for leaks at the gasket, this will cause the engine to run lean, as u can see there is no clear cut reason for this lean fuel condition. the code can also be caused by low fuel pressure or a plugged fuel injector injector or low flowing fuel injectors, the dealer would need to do these tests as it requires special equipment. MY experience? 35 years as a Ford trained electronic engine control specialist.
Posted on May 14, 2010
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Posted on Jan 02, 2017
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