CHECK ENGINE LIGHT - CODE: P1131

1999 Mercury Cougar

Tiny

ashleyd01

December, 4, 2010 AT 8:50 PM

My 1999 Mercury Cougar has the CE light on and the code read p1131. I can't afford to take it in to a shop right now, so what do I do to fix this?

FOUND 17083 RELATED QUESTIONS

2 Answers

Tiny

rasmataz

December, 4, 2010 AT 8:53 PM

DTC P1131 indicates the system is correcting RICH for an overly LEAN condition. The Heated Oxygen Sensor (HO2S) voltage is less than 0.45 volts. This is usually due to a vacuum leak after the MAF. It can also be caused by a bad PCV valve or PCV system hose.

It can also be caused by low fuel pressure or a plugged injector.

Tiny

ashleyd01

December, 4, 2010 AT 10:20 PM

How do I fix this?

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