OBD-II code · Powertrain (generic)
P0454 EVAP System Pressure Sensor/Switch A Circuit Intermittent
EVAP pressure sensor A signal jumps or drops out intermittently. The evaporative system captures fuel vapor from the tank and purges it into intake; leaks or stuck purge valves leak hydrocarbons and cause emissions failures.
Is it safe to drive with P0454?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
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
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Pressure Sensor
Related codes
- P0450EVAP System Pressure Sensor/Switch A Circuit
- P2B7EEVAP System Pressure Sensor/Switch C Circuit Intermittent
- P0451Evaporative Emission System Pressure Sensor Range/Performance
- P0452Evaporative Emission System Pressure Sensor Low Input
- P0453Evaporative Emission System Pressure Sensor High Input
- P0455Evaporative Emission System Leak Detected (Large Leak)
- P0456Evaporative Emission System Leak Detected (Very Small Leak)
- P0457Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.