how to fix P0302 code on BMW X3 F25 (2011-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the electrical components.
• Allow the engine to cool down.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket, ratchet.
• Sub-steps:
  1. Locate the ignition coil and spark plug for cylinder 2 (refer to the engine diagram).
  2. Remove the engine cover (if applicable) using the socket set.
  3. Disconnect the electrical connector from the ignition coil.
  4. Remove the ignition coil by unscrewing the retaining bolts and pulling it out.
  5. Unscrew the spark plug using the spark plug socket and ratchet.
  6. Install the new spark plug, ensuring it is torqued to the manufacturer's specifications (typically around 18-22 lb-ft).
  7. Install the new ignition coil and reconnect the electrical connector.

3. Clean or Replace Fuel Injector

• Tools Required: Fuel injector puller (if necessary), cleaning solvent (if cleaning).
• Sub-steps:
  1. Disconnect the fuel injector electrical connector.
  2. Remove any retaining clips or bolts securing the injector.
  3. If cleaning, use a specialized fuel injector cleaning solvent to clean the injector; otherwise, replace it with a new one.
  4. Reinstall the injector and ensure it is properly seated and secure.

4. Reassemble and Test

• Reinstall any components removed (like the engine cover).
• Reconnect the battery.
• Start the engine and allow it to reach operating temperature.