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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery negative terminal to ensure safety.
• Allow the engine to cool down before beginning work.

2. Address Fault Codes

• Sub-step 1: Using the OBD-II scanner, note all fault codes and their descriptions.
• Sub-step 2: Research codes to determine the likely affected systems (e.g., P0171 for lean condition, P0300 for misfires).
• Sub-step 3: Clear the codes and drive the vehicle for a short distance to see if they return.

3. Replace Faulty Components

• Sub-step 1: If specific components (e.g., O2 sensors, spark plugs) are indicated by the codes, replace them.
  • Tools Required: Socket set, torque wrench.
  • Parts Required: New O2 sensors, spark plugs, or ignition coils as necessary.
  • Safety Warning: Ensure the engine is cool before touching exhaust components.

4. Inspect and Clean Air Intake

• Sub-step 1: Remove the air filter and inspect it. Replace if dirty or clogged.
• Sub-step 2: Check for vacuum leaks in hoses connected to the intake manifold. Replace any damaged hoses.
• Sub-step 3: Clean the throttle body if buildup is present.

5. Fuel System Service

• Sub-step 1: Check the fuel filter and replace if it is clogged.
• Sub-step 2: Use a fuel system cleaner to clean injectors if performance issues persist.
• Sub-step 3: Test the fuel pump for proper pressure using a fuel pressure gauge.