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

Solution

1. Preparation

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

2. Addressing Fault Codes

• Sub-step 1: Using the OBD-II scanner, retrieve and document the trouble codes.
• Sub-step 2: Research the codes to identify the affected systems or components (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Clear the codes and take the vehicle for a test drive to see if they reappear.

3. Inspecting Components

• Sub-step 1: Check spark plugs for wear or fouling; replace if necessary using a torque wrench set to the manufacturer’s specifications.
• Sub-step 2: Inspect ignition coils for cracks or damage; replace any faulty coils.
• Sub-step 3: Examine the fuel injectors for proper operation; clean or replace as needed.

4. Vacuum and Hoses Check

• Sub-step 1: Visually inspect all vacuum lines for cracks or disconnects; replace any damaged hoses.
• Sub-step 2: Use a smoke machine or carburetor cleaner to test for vacuum leaks; repair any leaks found.

5. Fuel System Inspection

• Sub-step 1: Check fuel pressure using a fuel pressure gauge; ensure it meets manufacturer specifications.
• Sub-step 2: Replace the fuel filter if it is clogged or has not been serviced as per maintenance schedule.