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P1131 Diagnostic Trouble Code Discussion for April 2018

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 Expedition Eddie Bauer 4.6L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on VIN: 1FMRU18W2W
P1131: oxygen sensor b1s1 lean condition. Vehicle received running poorly with multiple codes. Scanner showed no activity on the two front sensors and would stay in open loop. Sprayed carb cleaner into vacuum line and vehicle performed much better, front oxygen sensors began switching and went int...
April 13, 2018
1998 Ford Expedition Eddie Bauer 4.6L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on VIN: 1FMRU18W2W
P1131: oxygen sensor b1s1 lean condition. ... multiple codes. Scanner showed no activity on the two front sensors and would stay in open loop. Sprayed carb cleaner into vacuum line and vehicle performed much better, front oxygen sensors began switching and went into closed loop. I'm assuming a va...
April 14, 2018