why is my BMW 3 Series F30/F31 (2012-2019) getting error code P0302

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Carefully remove the ignition coil from cylinder 2 by unbolting it and disconnecting the electrical connector.
• Inspect the ignition coil for cracks or damage.
• Remove the spark plug from cylinder 2 using a spark plug socket, and inspect it for fouling or wear.
• Replace the spark plug if it appears worn or fouled.

3. Check Fuel Injector

• Tools Required: Fuel injector puller (if needed).
• Remove the fuel rail, being careful to relieve fuel pressure prior.
• Inspect the fuel injector for cylinder 2; ensure it is clean and functioning correctly.
• If necessary, replace the fuel injector.

4. Test Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2 and install the compression tester.
• Crank the engine and monitor the compression reading.
• Compare the reading to manufacturer specifications; if low, further investigation into engine internals may be required.

5. Reassemble and Reconnect

• Reinstall the fuel rail and any other components removed during inspection.
• Reconnect the ignition coil and ensure all electrical connections are secure.
• Reinstall the engine cover if removed.
• Reconnect the negative battery terminal.