Evaporative Emission Control System Pressure Sensor Range/Performance
Table of contents
- Possible Causes
- How To Fix
- Tech Notes
- Cost To Diagnose
- When is the code detected
- Possible Symptoms
- Description
P0451 MERCURY 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)
How do I fix code P0451 MERCURY?
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’s pins.
Tech Notes
- There is a Factory Service Bulletin for the following Mercury Models:
- 2005-2008 Mercury Mariner
- 2006-2008 Mercury Mariner Hybrid
- 2005-2008 Mercury Mariner Factory Service Bulletin OBDII Code P0451
Cost of diagnosing the P0451 MERCURY code
The cost of diagnosing the P0451 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
An improper voltage signal from EVAP control system pressure sensor is sent to Engine Control Module (ECM).
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0451 MERCURY 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.