P0451: Evaporative Emission System Pressure Sensor/Switch Range/Performance

What does P0451 mean?

The EVAP pressure sensor reading is out of the expected range.

Generic OBD-II definition: Evaporative Emission System Pressure Sensor/Switch Range/Performance. Confirm applicability in your vehicle service information.

Common causes

• Faulty fuel tank pressure sensor
• Wiring issue

Symptoms

• Usually no drivability symptoms
• Possible faint fuel smell
• Will likely fail an emissions inspection

Can I keep driving with P0451?

Severity: Low Usually safe to keep driving, but get it checked.

If the check engine light is flashing or the car runs badly, stop driving and have it checked.

Typical fixes

• Inspect sensor and wiring
• Replace sensor