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P1131 Diagnostic Trouble Code Discussion for May 2012

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
2003 Ford E-150 4.2L Poor Idle Quality, Hesitation VIN: 1FTRE14283
P1131: o2 11 lean limit. Vehicle came in with no power, misfire...tested and found cyl one and two intake valves melted so bad that they had pulled up into the head. removed both heads and sent to machine shop for checking, planing and valves and guides. after putting this all back to...
May 14, 2012
1999 Ford E-350 Econoline Club Wagon Custom 6.8L Misfire VIN: 1FTSS34S0X
P1131: HO2S11 indicates lean. Van was driven in running poorly, CEL was on. Immediately noticed PCV hose had been left disconnected after customer replaced heater hose. Plugged it in, pulled codes for cyl head overtemp active and overtemp sensed, H02S11 indicates lean, as well as random mi...
May 29, 2012