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P1131 Diagnostic Trouble Code Discussion for April 2007

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
1997 Ford Contour GL 2.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1FALP6534V
P1131: Lack of HO2S b1s1 indicates lean. We pull codes & found code p1131 Lack of ho2s indicates lean, Also stft shows about -13 & ltft -11 We found spark a little too black (fuel fouled) like running too rich, Check vaccum leaks with a smoke machine & found a small leak @ egr valve diaph...
April 02, 2007