P051F OBD II Trouble Code Positive Crankcase Ventilation Filter Restriction

How to easily diagnose, repair, and info on causes of a P051F trouble code which indicates a detected PCV - positive crankcase ventilation - filter restriction.

Symptoms of P051F OBD II Trouble Code

  • Engine oil leaks
  • Smoke (steam) from underhood area
  • Hissing (sucking) noise from engine area
  • Drivability issues created by a vacuum leak

Common Causes of P051F OBD II Trouble Code

  • Clogged (bad) PCV filter
  • Faulty PCV valve
  • Defective crankcase pressure sensor
  • Open or shorted crankcase pressure sensor wiring
  • PCM malfunction or PCM programming error

Severity of P051F OBD II Trouble Code

Excessive crankcase pressure may result in engine oil leaks. A code P051F should be categorized as severe and addressed accordingly.