why is my BMW 5 Series G30/G31 (2017-2024) engine light flashing while driving?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery before working on electrical components.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the electrical connectors from the ignition coils.
  3. Remove the ignition coils using a socket set.
  4. Inspect the spark plugs for wear; replace if necessary.
  5. Install new ignition coils and reconnect the electrical connectors.
  6. Reinstall the engine cover.

3. Check and Repair Fuel System

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Attach the fuel pressure gauge and start the engine.
  3. Observe the pressure reading; it should match manufacturer specifications (usually around 50-60 psi).
  4. If pressure is low, inspect the fuel pump and fuel filter for blockages and replace them if necessary.
  5. Reconnect the fuel pressure gauge and ensure all fittings are secure.

4. Inspect Air Intake and Vacuum Lines

• Sub-steps:
  1. Visually inspect the air intake ducting for any cracks or loose connections.
  2. Check the mass airflow sensor (MAF) for contamination; clean or replace if necessary.
  3. Inspect all vacuum hoses for signs of wear or disconnection, replacing any damaged sections.