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?
Saturday, December 4th, 2010 AT 8:50 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.