1999 Mercury Cougar Repair Question
Topics covered: Fuel pressure, Pcv valve, Sensor.
Mileage: 95,700 miles.
Mileage: 95,700 miles.
Asked on December 4, 2010
Check engine light - code: p1131
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?
Asked by ashleyd01Answer
Replied on December 4, 2010
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.
