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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Leak at orifice or sealCommon
Parts involved
- EVAP Leak Detection Pump
P043F is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.