how to fix P0302 misfire code in BMW X3 G01 (2018-2024)

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil cover if applicable.
• Remove the ignition coil from cylinder 2 by unscrewing it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for fouling or wear. If damaged, replace it with a new one, ensuring it matches OEM specifications.
• Torque the new spark plug to the manufacturer's specifications (typically around 18-22 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Check the ignition coil for cracks or signs of electrical arcing.
• Replace the ignition coil if faulty by reversing the removal steps (connect the electrical connector and secure it with the screws).

4. Check Fuel Injector

• Remove the fuel injector connector from cylinder 2.
• Use a multimeter to test the injector's resistance (consult OEM specifications for the correct resistance range).
• Replace the injector if it is out of specification, following the removal and installation procedure detailed in the service manual.

5. Check for Vacuum Leaks

• Inspect hoses and gaskets for any signs of wear or damage.
• If leaks are found, replace the affected hoses or gaskets as needed.

6. Final Assembly

• Reinstall the ignition coil and any covers removed during the process.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.