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P1131 Diagnostic Trouble Code Discussion for June 2005

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 Mercury Mystique GS 2.0L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1MELM6538V
P1131: upstream o2 sensor lean. ... originally with mil light on & p1131 code [ up o2 lean ]- road tested 20 miles ,could not duplicate . all sensor readings ok at this time . I gave the car car back to the customer . 1 week later , car returned on the hook with same code & now com...
June 21, 2005