how to fix P0302 code on my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle battery to avoid electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Fuel injector tester
• Screwdriver set

2. Replace Spark Plug and Ignition Coil

1. Remove Engine Cover: If applicable, take off the engine cover to access the ignition components.
2. Remove Ignition Coil:
   • Unscrew the bolts holding the ignition coil for cylinder 2.
   • Carefully pull the ignition coil out of the cylinder head.
3. Replace Spark Plug:
   • Using a spark plug socket, remove the spark plug from cylinder 2.
   • Inspect the old spark plug for wear; replace it with a new spark plug (ensure correct gap).
4. Install New Ignition Coil:
   • Insert the new ignition coil into the cylinder head.
   • Torque the ignition coil bolts to the manufacturer's specifications (typically 7-10 Nm).
5. Reinstall Engine Cover: If removed, place the engine cover back on.

3. Check Fuel Injector

1. Remove Fuel Injector:
   • Disconnect the electrical connector from the fuel injector on cylinder 2.
   • Unscrew and remove the fuel injector using a socket.
2. Test Fuel Injector:
   • Use a fuel injector tester to ensure it is functioning properly. If faulty, replace with a new fuel injector.
3. Reinstall Fuel Injector:
   • Apply a small amount of engine oil to the O-ring of the new injector before installation.
   • Secure the injector in place and reconnect the electrical connector.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0302 code from the vehicle's computer.