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P1131 Diagnostic Trouble Code Discussion for September 2005

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
1999 Mercury Cougar 2.5L MIL Lamp on VIN: 1ZWFT61L2X
P1131: o2 sensor 11 shows lean. How do you get to O2 sensor 11. Can get my hand on it, but what about the wrench?? Alldata give .6, so those guys think its easy, who don"t I???
September 12, 2005
2003 Ford F-150 Lariat 5.4L MIL Lamp on VIN: 1FTRX18LX3
P1131: Lean Bnk1. Came in with check eng. light-scanned for codes and came up with the PO133 and PO135 for oxy. sensor. After replacing sensor test drove and checked again. Now has come up with code PO1131-Lean Bnk1. Smoke test found no leaks at intake as of now. also changed f...
September 14, 2005