LEMON Manuals: Even more car manuals for everyone
Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P0300: - Random Misfire Detected

DTC P0300: - Random Misfire Detected

DTC P0300: - RANDOM MISFIRE DETECTED

Description:  The random misfire DTC indicates multiple cylinders are misfiring or the powertrain control module (PCM) cannot identify which cylinder is misfiring.
Possible Causes: 
  • Camshaft position (CMP) sensor
  • Low fuel (less than 1/8 tank)
  • Stuck open exhaust gas recirculation (EGR) valve
  • Blocked EGR passages
Diagnostic Aids:  One or more EGR passages may be blocked or partially blocked. If this is the case the misfire detection monitor indicates the EGR port to check for possible blockage.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All - - GO to Pinpoint Test HD .