how to fix the P0302 code in my BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover (if applicable) by unscrewing any securing bolts.
• Disconnect the ignition coil connector for cylinder 2.
• Use a spark plug socket to unscrew the spark plug from cylinder 2.
• Inspect the old spark plug for wear; replace it with a new one, ensuring it is gapped according to specifications (typically 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's specifications (usually around 15-20 Nm).
• Reconnect the ignition coil and engine cover.

3. Test/Replace Ignition Coil

• Tools Required: Multimeter, socket set
• If the spark plug replacement does not resolve the issue, remove the ignition coil for cylinder 2.
• Test the ignition coil with a multimeter for proper resistance (typically 0.5-1.5 ohms; refer to specifications).
• If the coil is defective, replace it with a new one.
• Reinstall the ignition coil and ensure it’s secured properly.

4. Inspect/Replace Fuel Injector

• Tools Required: Fuel injector removal tool, socket set
• If misfires continue, remove the fuel injector from cylinder 2.
• Inspect the injector for clogs or damage; clean or replace it as necessary.
• Reinstall the injector and ensure it’s sealed correctly.