my BMW X5 G05 (2019-2024) has a check engine light and won't start, why?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal for safety.

2. Address Battery Issues

• Sub-steps:
  1. Use a multimeter to check the battery voltage; if below 12.4 volts, proceed to jump-start the vehicle or replace the battery.
  2. If jump-starting, ensure proper jump-starting procedures are followed.
  3. Once the vehicle starts, test the charging system to ensure the alternator is functioning properly (voltage should be around 13.7-14.7 volts).

3. Fuel System Check

• Sub-steps:
  1. If the fuel level is low, add an appropriate amount of fuel to the tank.
  2. If the fuel pump is not functioning, access the fuel pump relay and replace if necessary.
  3. Replace the fuel pump if it does not activate or if testing indicates failure.

4. Key Fob & Ignition Verification

• Sub-steps:
  1. Check the key fob battery; replace if necessary.
  2. Attempt to start the vehicle with a spare key fob if available.
  3. If the vehicle still does not start, inspect the ignition switch for any issues.

5. Clear Codes & Test Start

• Sub-steps:
  1. Use the OBD-II scanner to clear any error codes that may have been logged.
  2. Attempt to start the vehicle again after completing previous checks and repairs.