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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls - Powertrain DTC Charts & Descriptions - (Hybrid)) >> Diagnostic Trouble Code (DTC) Charts and Descriptions >> DTC P0300: Random Misfire Detected

DTC P0300: Random Misfire Detected

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P0300 - RANDOM MISFIRE DETECTED

Description:  The random misfire DTC indicates multiple cylinders are misfiring or the PCM cannot identify which cylinder is misfiring.
Possible Causes: 
  • Camshaft position (CMP) sensor
  • Low fuel, less than 1/8 tank
  • Stuck open 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 . GO to PINPOINT TEST HD .