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P1131 Diagnostic Trouble Code Discussion for November 2009

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
2002 Ford F-150 XL 4.2L Misfire VIN: 1FTRF17262
P1131: lean condition bank 1. I was brought this truck after everyone else gave up on it. It has a strong flutter at approximately 1500 rpm and at acceleration under load. I did smoke tests on vac system- checked good, I did fuel pressure tests-35-45psi, I checked injectors- all were firin...
November 10, 2009