AutoCodes – Mercury – P0455 Mercury

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

Quick Answer

Vehicles that meet enhanced evaporative requirements utilize a vacuum-based evaporative system integrity check. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. 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 Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
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 8,147

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 Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0455 Mercury Description

Vehicles that meet enhanced evaporative requirements utilize a vacuum-based evaporative system integrity check. The EVAP system integrity check uses a Fuel Tank Pressure Transducer (FTPT), a Canister Vent Solenoid (CVS) and Fuel Level Input (FLI) along with the Vapor Management Valve (VMV) or Electric Vapor Management Valve (EVMV) to find 0.040" diameter or larger EVAP system leaks. Federal vehicles can utilize a 0.040" leak check rather than the 0.020" leak check required for California vehicles.
The Diagnostic Trouble Code (DTC) will set when the EVAP control system has a very large leak such as the fuel filler cap fell off, the EVAP control system does not operate properly.

OBDII Code P0455 Mercury - Evaporative Emission Control System Leak Detected Gross Leak - AutoCodes.com — P0455 Mercury Code - Evaporative Emission Control System Leak Detected Gross Leak

What does this mean?

What are the Possible Causes of the DTC P0455 Mercury?

Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
EVAP canister or fuel tank leaks
EVAP system hose leaking
Fuel tank leaking

How to Fix the DTC P0455 Mercury?

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 does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0455 Mercury 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.

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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.