why does my Ford Mustang S550 (2015-2023) check engine light keep coming on

Solution

1. Preparation

• Gather tools and parts required for repairs.
• Ensure the vehicle is parked on a level surface and is in "Park" or "Neutral" with the parking brake engaged.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Address Error Codes

• Connect the OBD-II scanner, and note any error codes.
• Clear the codes and perform a road test to see if they return.
• If codes reappear, diagnose the specific issue indicated by the code (e.g., P0301 for misfire in cylinder 1).

3. Replace Faulty Components

• Spark Plugs and Coils:

  • Remove the engine cover if necessary.
  • Disconnect the ignition coil connectors.
  • Remove the bolts securing the ignition coils and pull them out.
  • Replace spark plugs using a socket wrench, ensuring to use the correct gap setting.
  • Reinstall ignition coils and secure them with bolts; reconnect the connectors.

• Mass Airflow Sensor:

  • Locate the MAF sensor on the intake duct.
  • Disconnect the electrical connector and remove the screws securing the sensor.
  • Install a new MAF sensor and reconnect the electrical connector.

4. Inspect Fuel System

• Check fuel lines and connections for leaks.
• If necessary, replace the fuel filter.
• If the fuel pump is faulty, replace it by removing the fuel tank access panel and disconnecting the pump.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle, checking for any abnormal noises or issues.
• Monitor the check engine light to ensure it does not illuminate again.