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P0455 Lincoln Code - Evaporative Emission Control System Leak Detected Gross Leak

Quick Answer

The P0455 diagnostic trouble code (DTC) indicates that the vehicle's on-board diagnostic (OBD) system has detected a large leak in the evaporative emission control system. Common causes include Loose or damaged gas cap, Cracked or disconnected hoses in the evaporative emission system, Faulty purge valve. 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
P0455 Lincoln indicates Evaporative Emission Control System Leak Detected Gross Leak.
Common causes
Common causes include Loose or damaged gas cap, Cracked or disconnected hoses in the evaporative emission system, Faulty purge valve.
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 Aug 30, 2024
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Code P0455 Lincoln Description

The P0455 diagnostic trouble code (DTC) indicates that the vehicle's on-board diagnostic (OBD) system has detected a large leak in the evaporative emission control system. This system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. A gross leak in this system can lead to increased emissions, decreased fuel efficiency, and potential safety hazards. The evaporative emission control system includes components such as the charcoal canister, purge valve, fuel tank pressure sensor, and various hoses and connectors.

OBDII Code P0455 Lincoln - Evaporative Emission Control System Leak Detected Gross Leak
P0455 Lincoln Code - Evaporative Emission Control System Leak Detected Gross Leak

Common Causes of P0455 Lincoln

  1. Loose or damaged gas cap
  2. Cracked or disconnected hoses in the evaporative emission system
  3. Faulty purge valve
  4. Leaking charcoal canister
  5. Damage to the fuel tank or fuel filler neck

Symptoms of P0455 Lincoln

  1. Check Engine Light illuminated
  2. Strong fuel odor near the vehicle
  3. Decreased fuel efficiency
  4. Difficulty starting the engine
  5. Hissing or hissing sound near the fuel tank

How to Fix P0455 Lincoln

  1. Begin by inspecting the gas cap to ensure it is tight and in good condition.
  2. Check all hoses and connections in the evaporative emission system for leaks or damage.
  3. Test the purge valve to determine if it is functioning properly.
  4. Inspect the charcoal canister for leaks or damage and replace if necessary.
  5. If the issue persists, further diagnostic testing may be required to pinpoint the exact source of the leak.

Cost to Fix P0455 Lincoln

The cost of repairing a P0455 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, repairing a gross leak in the evaporative emission control system can range from $100 to $500. This cost includes parts such as a new gas cap, hoses, purge valve, or charcoal canister, as well as labor for diagnosis and repair. It's recommended to consult with a qualified mechanic or auto repair shop for an accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0455 Lincoln

The P0455 is a common code since it will set if the gas cap is loose or missing. Start by tightening the gas cap and clearing the code. In most cases, the code can be clear by disconnecting the car battery for about 30 minutes.

There is a factory service bulletin for the following Lincoln vehicles:
1997-1998 Lincoln Mark VIII
1997-2002 Lincoln Continental
1997-2003 Lincoln Town Car
2000-2003 Lincoln LS
1998-2003 Lincoln Navigator
2002-2003 Lincoln Blackwood
Lincoln Factory Service Bulletin OBDII Code P0455

Need more information about the P0455 Lincoln code?

Need more information on how to fix the P0455 Lincoln code? Get Access to Factory Service Manuals

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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 P0455 Lincoln Code

1. What does OBDII code P0455 for Lincoln mean?

The P0455 code indicates that the Evaporative Emission Control System has detected a gross leak.

2. What are the common symptoms of a P0455 code in a Lincoln vehicle?

Common symptoms include the check engine light being illuminated, the smell of fuel vapors, and potential difficulty starting the vehicle.

3. What are the possible causes of a P0455 code in a Lincoln?

Potential causes include a loose or damaged gas cap, a cracked or loose EVAP hose, a faulty EVAP canister, or issues with the EVAP purge valve.

4. How serious is a P0455 code in a Lincoln?

While the vehicle may still be drivable with a P0455 code, it is important to address the issue promptly to prevent potential fuel leaks and emissions problems.

5. How do I diagnose a P0455 code in my Lincoln?

Diagnosing a P0455 code typically involves inspecting the EVAP system components, checking for visible damage or leaks, and using a scan tool to pinpoint the exact source of the issue.

6. Can I repair a P0455 code in my Lincoln myself?

Depending on the cause of the code, some repairs may be DIY-friendly, such as tightening or replacing a gas cap. However, more complex issues may require professional diagnosis and repair.

7. What are some tips for repairing a P0455 code in a Lincoln?

Ensure the gas cap is securely tightened, visually inspect EVAP system components for damage, check for loose or disconnected hoses, and consider performing a smoke test to detect leaks.

8. How much does it typically cost to repair a P0455 code in a Lincoln?

The cost of repairing a P0455 code can vary widely depending on the cause of the issue and whether professional diagnosis and repair are needed. Simple fixes like replacing a gas cap may be relatively inexpensive.

9. What happens if I ignore a P0455 code in my Lincoln?

Ignoring a P0455 code can lead to increased emissions, decreased fuel efficiency, and potential safety hazards due to fuel leaks. It is recommended to address the issue promptly.

10. How can I prevent a P0455 code from appearing in my Lincoln in the future?

To prevent a P0455 code, regularly check and maintain your vehicle's EVAP system, ensure the gas cap is properly tightened after refueling, and address any fuel system issues promptly.

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