Possible causes
– Faulty Evaporative Emission System (EVAP) Vapor Pressure Sensor
– Evaporative Emission System (EVAP) Vapor Pressure Sensor harness is open or shorted
– Evaporative Emission System (EVAP) Vapor Pressure Sensor circuit poor electrical connection
– Faulty Engine Control Module (ECM)
– Evaporative Emission System (EVAP) Vapor Pressure Sensor harness is open or shorted
– Evaporative Emission System (EVAP) Vapor Pressure Sensor circuit poor electrical connection
– Faulty Engine Control Module (ECM)
When is the obd code mean?
Vapor pressure sensor output extremely changes under conditions of (a) and (b): (2 trip detection logic) – Vehicle speed: 0 km/h (0mph), Engine speed: Idling and VSV for pressure switching valve is OFF
Vapor pressure sensor value opening pressure valve of charcoal canister
Vapor pressure sensor value opening pressure valve of charcoal canister
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0451 LEXUS OBD Code Description
The Evaporative Emission System (EVAP) vapor pressure sensor, VSV for canister closed valve (CCV) and VSV for pressure switching valve are used to detect abnormalities in the evaporative emission control system. The Engine Control Module (ECM) decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal.
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