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P1131 Diagnostic Trouble Code Discussion for September 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
1998 Mercury Mystique GS 2.0L Hesitation, Surge, MIL Lamp on VIN: 1MEFM6530W
P1131: Lack of 02 switches. Once again, the blue oval has kicked me in the teeth. This car has a seriously lean condition, verifyed by 3 codes (listed) and also confirmed by the performance and low 02 volts. Road tested with fuel pressure guage visible on windsheild and found pressure we...
September 05, 2007