P04F0 — EVAP System High Load Purge Line A Performance
On engines that have a separate high-load purge line - to use boost pressure to pull vapor on turbo applications - the ECU monitors flow when this path is commanded. The flow is below the expected level - the venturi, line, or check valve is restricted, or the line is incorrectly routed.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Evap high load purge line a
- Evap purge venturi
- Evap check valve
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Line, venturi or check valve restricted
Possible symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.