OBD-II code · Powertrain (generic)
P043E EVAP System Leak Detection Reference Orifice Low Flow
During the EVAP leak-detection self-test, the calibration airflow through the reference orifice is below the expected rate. The orifice may be partially blocked.
Is it safe to drive with P043E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyReference orifice partially blocked
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, Evap Canister
Related codes
- P043BCatalyst Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 2)
- P043CCatalyst Temperature Sensor Circuit Low (Bank 2 Sensor 2)
- P043DCatalyst Temperature Sensor Circuit High (Bank 2 Sensor 2)
- P043FEVAP System Leak Detection Reference Orifice High Flow
- P0440Evaporative Emission Control System Malfunction
- P0441Evaporative Emission System Incorrect Purge Flow
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.