why does my BMW 5 Series F10/F11 (2010-2017) check engine light keep coming on

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, multimeter, and vacuum gauge.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Address Error Codes

• Connect the OBD-II scanner and retrieve stored trouble codes.
• Note the codes and research their meanings. For example, P0420 indicates a catalytic converter efficiency issue.

3. Inspect and Replace Faulty Components

• Gas Cap: If the code indicates an EVAP system leak, replace the gas cap if it is damaged or not sealing properly.
• MAF Sensor: If codes point to MAF issues, clean it using MAF sensor cleaner. If cleaning does not resolve the issue, replace the MAF sensor.

4. Check for Vacuum Leaks

• Use a vacuum gauge or soapy water to check for leaks in the intake hoses and gaskets. Replace any damaged components.

5. Repair Exhaust System

• Inspect the exhaust system for leaks. Repair or replace damaged sections, including the catalytic converter if indicated by error codes.

6. Clear Codes and Test

• After repairs, clear the error codes using the OBD-II scanner.
• Start the engine and allow it to reach operating temperature. Monitor for any reoccurring codes.