P0454EVAP System Pressure Sensor/Switch A Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. The tank pressure sensor measures small pressures around ambient for the leak tests. Its direction differs by maker – on GM vacuum raises the voltage, on Ford and Bosch pressure does – so low and high refer to the signal voltage only. P0454 means the signal jumps. Ford checks continuously for a jump above about 1 kPa between two samples 100 ms apart or a brief open or short. GM (and the Saab 9-4X) checks only during the engine-off leak test: a jump of about 112 Pa within 1 s that refuelling cannot explain, 2 of 3 tests, MIL on the first trip. Saab's ME9 does not use the code. The engine-off small-leak test is then discarded.
- What you may notice
- Check engine light on
- EVAP readiness not set, emission inspection not passed
- No change in driving
- Likely causes
- LikelyLoose contact at the connector to the tank pressure sensor
- PossibleChafed harness at the tank
- PossibleSensor faulty internally (noisy signal)
- RareFuel sloshing in an overfilled tank or refuelling misdetected
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.