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P1131 Diagnostic Trouble Code Discussion for June 2010

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 V6 2.5L MIL Lamp on VIN: 1ZWFT61L9X
P1131: O2 lean bank 1. Thanks to all. I have this cougar with a 2.5 V6, with what I believe is a vacuum leak. Please read the repair history to go along with this. I have disconnected the battery & cleared the computer. When the vehicle is started the short term fuel trims will ...
June 09, 2010