P043F OBD II Trouble Code Evaporative Emission System Leak Detection Reference Orifice High Flow

How to quickly diagnose, repair, and what causes of a P043F code that indicates an evap leak reference orifice with high flow.

Symptoms of P043F OBD II Trouble Code

  • No symptoms will likely be exhibited
  • Hissing or humming sound (even when the ignition switch OFF)
  • Slightly diminished fuel efficiency
  • Other EVAP leak detection codes may be stored

Common Causes of P043F OBD II Trouble Code

  • Defective EVAP pressure sensor
  • Faulty vent control or purge control solenoid
  • Bad leak detection pump

Severity of P043F OBD II Trouble Code

EVAP leak detection codes, similar to the P043F, deal exclusively with the evaporative emission control system and should not be classified as severe.