OBD-II code · Powertrain (generic)
P043F EVAP System Leak Detection Reference Orifice High Flow
During the leak-detection self-test, airflow through the reference orifice is above the expected rate — typically a leak around the orifice or a damaged seal.
Is it safe to drive with P043F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLeak at orifice or seal
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Leak Detection Pump
Related codes
- P043EEVAP System Leak Detection Reference Orifice Low Flow
- P043CCatalyst Temperature Sensor Circuit Low (Bank 2 Sensor 2)
- P043DCatalyst Temperature Sensor Circuit High (Bank 2 Sensor 2)
- P0440Evaporative Emission Control System Malfunction
- P0441Evaporative Emission System Incorrect Purge Flow
- P0442Evaporative Emission System Leak Detected (Small Leak)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.