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Engine-Codes – Generic – P0451

P0451 Code - Fuel Tank Pressure Sensor Performance

Quick Answer

The P0451 code indicates that there is a performance issue with the fuel tank pressure sensor in the vehicle. Common causes include Faulty fuel tank pressure sensor, Wiring issues, Evaporative emissions control system problems. 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 indicates Fuel Tank Pressure Sensor Performance.
Common causes
Common causes include Faulty fuel tank pressure sensor, Wiring issues, Evaporative emissions control system problems.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0451 Description

The P0451 code indicates that there is a performance issue with the fuel tank pressure sensor in the vehicle. This sensor is responsible for monitoring the pressure inside the fuel tank, which is crucial for the proper functioning of the vehicle's evaporative emissions control system. When the sensor detects a problem, it triggers the check engine light and stores the P0451 code in the vehicle's computer system.

OBDII Code P0451 - Fuel Tank Pressure Sensor Performance
P0451 Code - Fuel Tank Pressure Sensor Performance

Common Causes of P0451

  1. Faulty fuel tank pressure sensor
  2. Wiring issues
  3. Evaporative emissions control system problems
  4. Vacuum leaks
  5. Fuel cap not properly sealed

Symptoms of P0451

  1. Check engine light is illuminated
  2. Decreased fuel efficiency
  3. Vehicle stalls or has difficulty starting
  4. Emissions control system issues
  5. Rough idling

How to Fix P0451

  1. Diagnose the issue by using a scan tool to read the code and confirm the sensor is faulty.
  2. Inspect the wiring and connections to ensure there are no loose or damaged components.
  3. Replace the fuel tank pressure sensor with a new, OEM-quality part.
  4. Clear the code from the vehicle's computer system and test drive to ensure the issue is resolved.
  5. If the problem persists, further diagnostic testing may be required to identify any additional issues.

Cost to Fix P0451

The typical repair costs for addressing a P0451 code can range from $100 to $300, depending on the specific make and model of the vehicle, the cost of the replacement sensor, and the labor rates at the auto repair shop. It is important to factor in diagnostic time and potential additional repairs that may be needed to fully resolve the issue. It is recommended to consult with a qualified mechanic for a more accurate estimate based on the individual circumstances of the vehicle.

What does this mean?

Tech Notes for P0451









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Code P0451 Information for Specific Makes

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.

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