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

Quick Answer

The P0455 code for Mercury vehicles indicates that there is a gross leak detected in the Evaporative Emission Control System (EVAP). Common causes include Loose or missing gas cap, Damaged or disconnected EVAP hoses, 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 Mercury indicates Evaporative Emission Control System Leak Detected Gross Leak.
Common causes
Common causes include Loose or missing gas cap, Damaged or disconnected EVAP hoses, 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 Sep 12, 2024
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Code P0455 Mercury Description

The P0455 code for Mercury vehicles indicates that there is a gross leak detected in the Evaporative Emission Control System (EVAP). The EVAP system is designed to prevent harmful fuel vapors from escaping into the atmosphere. When a gross leak is detected, it means that there is a significant issue with the system that could potentially release a large amount of fuel vapors, posing environmental concerns and affecting the vehicle's performance.

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

Common Causes of P0455 Mercury

  1. Loose or missing gas cap.
  2. Damaged or disconnected EVAP hoses.
  3. Faulty purge valve.
  4. Defective fuel tank pressure sensor.
  5. Cracked or damaged charcoal canister.

Symptoms of P0455 Mercury

  1. Check engine light illuminated on the dashboard.
  2. Strong smell of gasoline near the vehicle.
  3. Decreased fuel efficiency.
  4. Hissing or whistling noise coming from the EVAP system.
  5. Difficulty starting the vehicle.

How to Fix P0455 Mercury

  1. Visually inspect the gas cap and ensure it is tight and properly sealed. Replace if damaged.
  2. Check all EVAP hoses for cracks, leaks, or disconnections. Replace any damaged hoses.
  3. Test the purge valve and replace if it fails to hold a vacuum or is stuck open.
  4. Inspect the fuel tank pressure sensor for any signs of damage or malfunction. Replace if necessary.
  5. Check the charcoal canister for cracks or damage and replace if needed.

Cost to Fix P0455 Mercury

The cost to repair a P0455 code on a Mercury vehicle can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair for this code can range from $100 to $500. It's important to note that diagnostic time and labor rates can vary between auto repair shops, with hourly rates typically ranging from $80 to $150. Additionally, costs may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable rates. It's recommended to obtain quotes from different shops to get an accurate estimate for the repair.

What does this mean?

Tech Notes for P0455 Mercury

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 Mercury vehicles:

1997-1999 Mercury Tracer

1997-2000 Mercury Mystique

1997-2003 Mercury Grand Marquis

1997-2003 Mercury Sable

1999-2002 Mercury Cougar

1997-2003 Mercury Mountaineer

Mercury Factory Service Bulletin OBDII Code P0455

When is the Code Detected?

EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.

Need more information about the P0455 Mercury 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 P0455 Mercury Code

1. What does the OBDII code P0455 for a Mercury mean?

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

2. What are the common symptoms of a P0455 code on a Mercury?

Common symptoms of a P0455 code may include the Check Engine Light being illuminated, a fuel odor around the vehicle, and potential issues with passing emissions tests.

3. What are the possible causes of a P0455 code on a Mercury?

Potential causes of a P0455 code include a loose or damaged gas cap, a leak in the fuel tank or fuel system, a faulty EVAP system purge valve, or a cracked or disconnected EVAP hose.

4. How serious is a P0455 code on a Mercury?

While a P0455 code may not cause immediate drivability issues, it can lead to increased emissions and decreased fuel efficiency. It is important to address the problem to maintain the proper functioning of the emissions system.

5. How can I diagnose a P0455 code on my Mercury?

Diagnosing a P0455 code typically involves inspecting the gas cap for tightness, visually checking for any obvious leaks in the fuel system, and using a smoke machine to pinpoint the source of the leak within the EVAP system.

6. Can I drive my Mercury with a P0455 code?

It is generally safe to drive your Mercury with a P0455 code, but it is recommended to address the issue promptly to prevent potential damage to the emissions system and ensure compliance with emission regulations.

7. How can I repair a P0455 code on my Mercury?

Repairing a P0455 code may involve tightening or replacing the gas cap, repairing or replacing damaged EVAP system components, such as hoses or valves, and clearing the code with a diagnostic tool after the repair is completed.

8. Will a P0455 code reset itself on a Mercury?

In some cases, the P0455 code may reset itself after the underlying issue is resolved and the vehicle goes through several drive cycles without detecting the problem. However, it is recommended to clear the code manually to ensure it does not reappear.

9. How much does it cost to repair a P0455 code on a Mercury?

The cost of repairing a P0455 code can vary depending on the cause of the issue and the specific parts that need to be replaced. Generally, the repair cost can range from $100 to $500, including parts and labor.

10. Can I prevent a P0455 code from appearing on my Mercury?

To help prevent a P0455 code, make sure to tighten the gas cap properly after refueling, perform regular maintenance on the EVAP system, and address any fuel system leaks promptly to maintain the integrity of the emissions control system.

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