Powertrain
generic / SAE
P0451
Evaporative Emission System Pressure Sensor Range/Performance
The fuel tank pressure sensor reading is implausible — for example, fluctuating signal, noise, or values that do not respond to known pressure events such as a key-on tank refill.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 51
Possible causes
- Tank pressure sensor drifted/noisy high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.5–2.5 h
- Component: fuel tank pressure sensor
- Component: sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012