how to fix P0302 misfire code on my BMW X5 G05 (2019-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the engine is cool and disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Compression tester

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector.
• Remove the ignition coil bolt using a socket and ratchet.
• Carefully pull out the ignition coil from cylinder 2.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for wear or damage; replace if necessary.
• Install the new spark plug and torque it to specifications (typically around 22 ft-lbs).
• Reinstall the ignition coil and connect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil is faulty, replace it by following these steps:
  • Remove any securing bolts and lift out the old ignition coil.
  • Install the new ignition coil and secure it with bolts.
  • Reconnect the electrical connector.

4. Check Fuel Injector

• If the issue persists, test the fuel injector:
  • Disconnect the fuel injector connector.
  • Use a multimeter to check for voltage and resistance.
  • If it is faulty, remove the fuel rail and replace the injector for cylinder 2.
  • Reinstall the fuel rail and reconnect all necessary connections.

5. Compression Test

• If misfire continues, perform a compression test on cylinder 2:
  • Remove the spark plug from cylinder 2.
  • Insert the compression tester into the spark plug hole.
  • Crank the engine and note the compression reading.
  • Compare it to manufacturer specifications (usually around 130-190 psi). If low, further engine diagnostics may be required.