p043f evaporative emission system reference orifice high flow
P043F – Evaporative Emission System Reference Orifice High Flow
Definition: This diagnostic trouble code (DTC) indicates that the evaporative emission system’s reference orifice is experiencing higher than expected flow. The vehicle’s onboard diagnostics have detected a discrepancy in the flow rate, which could be due to a malfunctioning component within the EVAP system.
p043f – Evaporative Emission System Reference Orifice High Flow
Typical Severity: Moderate
Common Causes
P043F – Evaporative Emission System Reference Orifice High Flow
Common causes:
- Fuel tank cap not sealed properly
- Damaged or leaking EVAP system hoses
- Faulty purge valve
- Defective charcoal canister
- EVAP system leak
Common Misdiagnosis
OBD2 Code: P043F
Description: Evaporative Emission System Reference Orifice High Flow
Common Misdiagnosis: Replacing the purge valve or vent valve without checking for leaks in the EVAP system or issues with the fuel tank pressure sensor.
Common Diagnostic Steps
OBD2 Code: P043F
Description: Evaporative Emission System Reference Orifice High Flow
- Inspect the gas cap for proper installation and seal integrity.
- Check for any visible damage or disconnections in the EVAP system hoses and lines.
- Perform a smoke test to identify leaks in the EVAP system.
- Test the purge valve and vent valve for proper operation using a scan tool or multimeter.
- Examine the charcoal canister for signs of clogging or damage.
- Verify that all electrical connections related to the EVAP system are secure and free of corrosion.
- If applicable, check for Technical Service Bulletins (TSBs) related to this code on your specific vehicle model.