why does my BMW 5 Series G30/G31 (2017-2024) engine light stay on after repair

Solution

1. Preparation

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

2. Inspect and Reconnect Components

• Sub-steps:
  1. Reconnect any disconnected sensors or wiring harnesses related to the recent repair.
  2. Inspect connectors for corrosion or damage and clean or replace as necessary.
  3. Ensure that all vacuum hoses are properly connected and free from cracks or leaks.

3. Sensor Inspection

• Sub-steps:
  1. Check the operation of the MAF sensor by performing a visual inspection for cleanliness.
  2. Use a multimeter to test the sensor’s voltage output against specifications found in the service manual.
  3. Replace the MAF sensor if it is outside the specified range.

4. Verify Repair

• Sub-steps:
  1. If applicable, check the integrity of the repaired component (e.g., gasket seals, intake manifold).
  2. Reinstall any covers or shields that were removed during repair.
  3. Reconnect the battery’s negative terminal and start the engine to check for CEL.