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P1131 Diagnostic Trouble Code Discussion for December 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 F-150 Lariat 5.4L Poor Fuel Economy, MIL Lamp on VIN: 1FTEF08L5V
P1131: Lean Bank 1 Sensor1. All the Ford Techs out there: Have a strange one for you. This truck wil go lean at high speed cruise, And will have very little accel above seventy miles an hour, yet the PCM is showing lean fuel trim corrections in the -5/-7 range. The Oxygen sensors are sho...
December 20, 2004
1997 Ford Expedition Eddie Bauer 4.6L MIL Lamp on VIN: 1FMEU1764V
P1131: EGR Out of Test Range. Hello. I am having a problem with this vehicle setting the codes listed. I have replaced the EGR valve and solenoid but the codes keep returning. I have made sure the EGR tube is clear and hoses to EGR Sensor are clear. Does anyone have an idea what could be w...
December 29, 2004