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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery (negative terminal) to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate the spark plug for cylinder 2.
  3. Use a spark plug socket and ratchet to remove the spark plug.
  4. Inspect the spark plug for wear or damage; replace if necessary.
  5. Install the new spark plug, tightening it to the manufacturer's specified torque (typically 15-20 Nm).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil on cylinder 2.
  2. Remove the ignition coil using a socket wrench.
  3. Inspect the coil for cracks or wear; replace if faulty.
  4. Install the new ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Use a multimeter to check the injector's resistance; compare with specifications.
  3. If faulty, remove the fuel injector using appropriate tools.
  4. Install a new fuel injector, ensuring proper seating.
  5. Reconnect the fuel injector and electrical connector.

5. Reassemble and Reconnect Battery

• Reinstall any components removed, such as the engine cover.
• Reconnect the negative battery terminal.