my BMW 5 Series G30/G31 (2017-2024) struggles to start after sitting overnight, what’s wrong?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, load tester, socket set, wire brush, and safety gloves.
• Safety Warnings: Disconnect the battery before performing any electrical work to avoid shocks or shorts.

2. Battery Replacement (if necessary)

1. Remove the Battery:
   • Disconnect the negative terminal first, then the positive terminal.
   • Remove any securing brackets and lift the battery out carefully.
2. Install New Battery:
   • Place the new battery into the tray and secure it with brackets.
   • Connect the positive terminal first, followed by the negative terminal.

3. Clean and Inspect Electrical Connections

1. Clean Battery Terminals:
   • Use a wire brush to remove any corrosion from the terminals and cable ends.
   • Apply a battery terminal protector to prevent future corrosion.
2. Check Starter Connections:
   • Inspect and tighten any loose connections to the starter motor.
   • Ensure that the ground connection is secure.

4. Test Fuel System (if applicable)

1. Check Fuel Pump Operation:
   • Turn the ignition on without starting the engine and listen for the fuel pump to prime.
   • If not audible, check the fuel pump relay and fuse.
2. Inspect Fuel Lines:
   • Look for leaks or blockages in the fuel lines leading to the engine.