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P1131 Diagnostic Trouble Code Discussion for February 2013

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
2001 Ford F-250 Super Duty Lariat 5.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTNX21L81
P1131: o2 sensor indicates lean. This 5.4 has a strange problem, It runs great but intermittently it will at idle began to lose cyl #1 through #4, Cylinder contribution will show 25-35% loss and will idle very poorly, Then will clear up and run great, idle in shop for 10 minutes and all the s...
February 27, 2013