Engine-Codes - Scion - P0451 2005 Scion xB

P0451 2005 Scion xB Code - EVAP System Pressure Sensor Range/Performance

- Code Popularity: 2,494 Views
- Repair Importance Level: 1/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0451 2005 Scion xB?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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
  • EVAP system hose (pipe from air inlet port to canister pump module, canister filter, fuel tank vent hose)
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P0451 2005 Scion xB?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0451 2005 Scion xB code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

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

What are Code Possible Symptoms?

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

What Does the P0451 2005 Scion xB Code Mean?

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.

P0451 2005 Scion xB Code - EVAP System Pressure Sensor Range/Performance

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