how to fix BMW 3 Series F30/F31 (2012-2019) check engine light after repairs

Solution

1. Preparation

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

2. Address Error Codes

• Use the OBD-II scanner to read and document all error codes.
• Research each code to determine the specific components or systems affected.
• Clear the codes and take the vehicle for a test drive to see if any codes reappear.

3. Inspect Repaired Components

• Check all repair work for completeness:
  • Verify that all clamps and bolts are tightened to specifications.
  • Ensure that replaced components, such as sensors or gaskets, are installed correctly.
• If a sensor was replaced, ensure it is the correct part number and is functioning.

4. Perform a Smoke Test (if applicable)

• If a vacuum leak is suspected, perform a smoke test to identify any air leaks in the intake system.
• Use a smoke machine to introduce smoke into the intake; observe for smoke escaping from any cracks or loose fittings.

5. Reconnect Battery

• After completing inspections and repairs, reconnect the negative battery terminal.
• Ensure all tools are removed from the engine bay before starting the vehicle.