AutoCodes – Mitsubishi – P0451 Mitsubishi

P0451 Mitsubishi Code - EVAP System Pressure Sensor Range/Performance

Quick Answer

The Evaporative Emission System (EVAP) control system pressure sensor detects pressure in the purge line. Common causes include 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. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0451 Mitsubishi indicates EVAP System Pressure Sensor Range/Performance.
Common causes: Common causes include 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.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 5,658

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0451 Mitsubishi 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.

OBDII Code P0451 Mitsubishi - EVAP System Pressure Sensor Range/Performance - AutoCodes.com — P0451 Mitsubishi Code - EVAP System Pressure Sensor Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0451 Mitsubishi?

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 to Fix the DTC P0451 Mitsubishi?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0451 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0451 Mitsubishi code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0451 Mitsubishi Code

1. What does OBD-II code P0451 mean for a Mitsubishi?

Code P0451 indicates a problem with the EVAP system pressure sensor, which is not functioning within its expected range or performance parameters.

2. What are the common symptoms of code P0451 in a Mitsubishi?

Symptoms may include the Check Engine Light turning on, difficulty refueling due to fuel tank pressure issues, and possible fuel odors near the vehicle.

3. What causes code P0451 to appear in a Mitsubishi?

Common causes include a faulty EVAP system pressure sensor, damaged wiring or connectors, issues with the EVAP system vent valve, or a malfunctioning charcoal canister.

4. Can I still drive my Mitsubishi with code P0451?

Yes, the vehicle is typically drivable, but ignoring the code may lead to reduced fuel efficiency or further damage to the EVAP system.

5. How do I diagnose code P0451 in a Mitsubishi?

Diagnosis involves checking the EVAP system pressure sensor, inspecting wiring and connectors for damage, and testing related EVAP components like the vent valve and charcoal canister.

6. How is code P0451 fixed in a Mitsubishi?

Repairs may include replacing the EVAP system pressure sensor, repairing damaged wiring, cleaning or replacing the vent valve, or addressing issues with the charcoal canister.

7. How much does it cost to repair code P0451 on a Mitsubishi?

The repair cost varies but typically ranges from $100 to $300 depending on the part being replaced and labor costs.

8. Can a loose gas cap cause code P0451 in a Mitsubishi?

While a loose gas cap can trigger other EVAP codes, it is less likely to cause P0451. However, checking the gas cap is still a good first step.

9. Does code P0451 affect emissions testing for a Mitsubishi?

Yes, an active P0451 code will cause your Mitsubishi to fail an emissions test since it indicates an issue with the EVAP system.

10. Should I reset the code P0451 without repairs on a Mitsubishi?

Resetting the code without addressing the underlying issue may make it temporarily disappear, but the problem will likely return and could worsen over time.