why does my Ford Mustang S550 (2015-2023) check engine light come on after filling gas

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Fuel Cap

• Sub-steps:
  • Remove the fuel cap and inspect for cracks or wear.
  • Clean the fuel filler neck with a cloth to remove any debris.
  • If damaged, replace the fuel cap with an OEM-spec part.
• Tools Required:
  • None specifically for this step.
• Safety Warnings:
  • Ensure the engine is off and cool before starting work.

3. Check for Fuel System Leaks

• Sub-steps:
  • Visually inspect the fuel lines and connections for signs of leaks or damage.
  • Use a fuel pressure gauge to check for proper fuel pressure.
  • If leaks are found, replace any damaged hoses or components.
• Tools Required:
  • Fuel pressure gauge
• Safety Warnings:
  • Work in a well-ventilated area to avoid inhaling fuel vapors.

4. Inspect EVAP System Components

• Sub-steps:
  • Locate and inspect the EVAP purge valve and canister for clogs or damage.
  • Use a multimeter to test the purge valve for proper operation.
  • Replace any faulty components as needed.
• Tools Required:
  • Multimeter
• Safety Warnings:
  • Disconnect the battery before working on electrical components.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear any trouble codes.
  • Test drive the vehicle to ensure the check engine light does not reappear.
• Tools Required:
  • OBD-II scanner