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P1131 Diagnostic Trouble Code Discussion for October 2004

Heated Oxygen Sensor (Bank 1 Sensor 1) Indicates A/F Ratio Too Lean

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Trouble Ticket Help Requests for DTC P1131
Help Request Posted
1997 Ford Expedition XLT 5.4L Misfire, MIL Lamp on VIN: IFMFU18L6V
i have ford expedition has codes p01131,p0171,p0172.idle surge and missing.so far i check for vacuum leak.i could not find any.i know smoke macine is the best way check for vacuum leak. unfortunately i dont have.check fitting at pressure regulator is ok.all va...
October 23, 2004