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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector.
• Remove the ignition coil from cylinder 2 using a socket.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for signs of wear, carbon buildup, or oil fouling.
• Install a new spark plug, ensuring it is the correct gap size (typically 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's specification (usually around 18 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was found defective, follow these steps:
• Remove the ignition coil from cylinder 2.
• Install the new ignition coil, ensuring it is seated properly.
• Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel rail if required to access the injector.
• Disconnect the fuel injector connector.
• Remove the fuel injector from cylinder 2.
• Inspect for clogs and clean the injector using a fuel injector cleaner.
• Reinstall the cleaned or new injector, ensuring proper alignment.
• Reconnect the fuel injector connector.

5. Perform Compression Test (if misfire persists)

• Remove the spark plug for cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and read the compression value.
• Compare with manufacturer specifications; if low, further engine diagnostics may be required.