P0457 1999 Ford F150 Code - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off
Quick Answer
Vehicles that meet enhanced evaporative requirements utilize a vacuum-based evaporative system integrity check. Common causes include Missing fuel filler 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
- P0457 1999 Ford F150 indicates EVAP Control System Leak Detected Fuel Filler Cap Loose/Off.
- Common causes
- Common causes include Missing fuel filler 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.
Code P0457 1999 Ford F150 Description
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.
What are the Possible Causes of the DTC P0457 1999 Ford F150?
- Missing fuel filler cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
How to Fix the DTC P0457 1999 Ford F150?
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.
Code Tech Notes
There is a factory service bulletin for the 1999 Ford F-150:
1999 Ford F-150 Factory Service Bulletin OBDII Code P0457
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0457 1999 Ford F150 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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Frequently Asked Questions about P0457 1999 Ford F150 Code
1. What does the OBDII code P0457 mean on a 1999 Ford F150?
P0457 indicates an EVAP (Evaporative Emission Control) system leak, specifically due to a loose or missing fuel filler cap.
2. What are the symptoms of code P0457 in a 1999 Ford F150?
Common symptoms include the check engine light turning on, a potential fuel smell near the vehicle, and possibly reduced fuel efficiency.
3. What causes code P0457 to appear?
The most common cause is a loose, missing, or damaged fuel filler cap. Other causes may include a leak in the EVAP system or a faulty EVAP component.
4. How can I fix a P0457 code on my 1999 Ford F150?
Start by checking and tightening the fuel filler cap. If the cap is damaged, replace it. If the issue persists, inspect the EVAP system for leaks or faulty components.
5. Can a loose gas cap really trigger a P0457 code?
Yes, a loose or improperly sealed gas cap is the most frequent cause of this code, as it disrupts the EVAP system’s ability to maintain proper pressure.
6. How do I know if my gas cap is the problem for P0457?
Inspect the cap for cracks, missing seals, or worn threads. Tighten it properly and clear the code. If the code returns, further diagnosis is needed.
7. Can I drive my 1999 Ford F150 with a P0457 code?
Yes, but it’s not recommended to ignore the issue. The EVAP system helps reduce emissions, and a leak could lead to environmental harm or reduced fuel efficiency.
8. How do I clear the P0457 code after fixing the problem?
You can clear the code using an OBDII scanner. Alternatively, the code may clear itself after several drive cycles if the issue is resolved.
9. How much does it cost to fix a P0457 code on a 1999 Ford F150?
If the issue is just a gas cap, a replacement typically costs $10–$30. If EVAP system repairs are needed, costs can range from $100 to $500, depending on the problem.
10. What tools do I need to diagnose a P0457 code?
An OBDII scanner is essential for reading and clearing the code. A smoke machine may be needed to locate EVAP system leaks if the gas cap isn’t the issue.
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