how to fix the P0302 code for misfire in my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off and cooled down.
• Disconnect the negative battery terminal for safety.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the ignition coil for cylinder 2:
  • Unscrew any retaining bolts.
  • Gently pull the ignition coil out of the spark plug well.
• Remove the spark plug:
  • Use the spark plug socket to unscrew the old spark plug.
  • Inspect the old spark plug for signs of fouling or wear.
• Install the new spark plug:
  • Ensure the new spark plug is gapped correctly according to specifications.
  • Hand-tighten the spark plug, then torque it to the manufacturer's specified value (typically around 15-20 ft-lbs).
• Reinstall the ignition coil and ensure it is secure.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or faulty during inspection:
  • Disconnect the electrical connector.
  • Unscrew any mounting bolts and remove the ignition coil.
  • Install the new ignition coil, ensuring it clicks into place and is secured with bolts.

4. Inspect and Test Fuel Injector

• Remove the fuel injector for cylinder 2:
  • Disconnect the electrical connector.
  • Remove any retaining clips or screws.
  • Pull the injector out of the fuel rail.
• Inspect the injector for clogs or damage.
• If necessary, replace with a new injector.
• Reinstall the injector and reconnect the electrical connector.

5. Perform Compression Test

• Remove the spark plug for cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine a few times to record the compression reading. Compare with manufacturer specifications.
• If compression is low, further diagnosis may be necessary for potential engine issues.