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P1131 Diagnostic Trouble Code Discussion for August 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
1998 Ford F-150 Lariat 5.4L Poor Idle Quality VIN: 1FTRX08L6W
Thanks in advance...got an odd on here. Customer complained of a rough run. All codes indicate lean exhaust both banks. O2's were sluggish so we replaced them and now it has same problem but runs worse! problem only at idle. Bank to will clock around pos 22 at...
August 12, 2013