my BMW X5 G05 (2019-2024) has a code P0302, how to fix it

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if necessary to access spark plugs.
  2. Use a spark plug socket and ratchet to remove the spark plug from cylinder 2.
  3. Inspect the spark plug for signs of wear, such as fouling or excessive gap.
  4. If necessary, replace with a new spark plug that meets OEM specifications.
  5. Torque the new spark plug to the manufacturer's recommended value (typically around 18 lb-ft for BMW).

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 or ratchet.
  3. Inspect for cracks or damage; replace if needed.
  4. Install the new ignition coil and reconnect the electrical connector.

4. Test and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector on cylinder 2.
  2. Use a multimeter to test the injector's resistance; compare against specifications.
  3. If the injector is faulty, remove it from the engine using an injector puller.
  4. Install a new fuel injector and reconnect the connector.

5. Compression Test (if necessary)

• Sub-steps:
  1. Remove the spark plug from cylinder 2 again.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
  4. If the reading is below specifications, further diagnosis may be required for internal engine issues.