Possible causes

– Faulty Evaporative Emission System (EVAP) Pressure Sensor
– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
– Faulty Engine Control Module (ECM)

When is the code detected?

An improper voltage signal from EVAP control system pressure sensor is sent to Engine Control Module (ECM).

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0451 Description

The Evaporative Emission System (EVAP) control system pressure sensor detects pressure in the purge line. The sensor output voltage to the Engine Control Module (ECM) increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.

P0451 Information for specific makes

P0451 SUBARU
P0451 TOYOTA
P0451 SCION
P0451 LEXUS
P0451 ACURA
P0451 HONDA
P0451 CHRYSLER
P0451 JEEP
P0451 DODGE
P0451 FORD
P0451 HYUNDAI
P0451 INFINITI
P0451 NISSAN
P0451 ISUZU
P0451 KIA
P0451 MAZDA
P0451 MITSUBISHI
P0451 MERCURY