how to deal with P0302 code on my BMW 3 Series G20/G21 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:

  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect any electrical connectors from the ignition coil.
  3. Remove the ignition coil from cylinder 2.
  4. Unscrew the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear; replace it if necessary with the manufacturer's recommended type.
  6. Gap the new spark plug according to specifications and install it securely.

• Tools Required: Socket set, spark plug socket, torque wrench.

• Safety Warning: Ensure the ignition is off before handling electrical components.

3. Inspect and Replace Ignition Coil

• Sub-steps:

  1. If the spark plug is in good condition, check the ignition coil for signs of damage or corrosion.
  2. Replace the ignition coil if it appears faulty or has been in service for a long time.
  3. Reinstall the ignition coil and reconnect the electrical connector securely.

• Tools Required: Socket set, torque wrench.

• Safety Warning: Reconnect the battery only after all components are reinstalled.

4. Test Fuel Injector

• Sub-steps:

  1. Use a noid light to check the electrical signal to the injector.
  2. If no signal is detected, inspect wiring and connectors for damage.
  3. If the injector is not functioning, remove and replace it.
  4. Reinstall the new fuel injector, ensuring proper seating and sealing.

• Tools Required: Noid light, socket set.

• Safety Warning: Ensure fuel system is depressurized before working on fuel injectors.