how to fix P0301 code on BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector for cylinder 1.
  3. Remove the ignition coil bolt and lift the coil out.
  4. Remove the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear; replace if necessary (gap specification: 0.032-0.036 inches).
  6. Install the new spark plug and torque to 15 Nm (11 lb-ft).
  7. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, test the ignition coil resistance; if out of spec, replace the coil.
  2. Remove the faulty ignition coil and install a new one.
  3. Reconnect the ignition coil connector and ensure proper seating.

4. Fuel Injector Inspection

• Sub-steps:
  1. If the misfire persists, check the fuel injector for cylinder 1.
  2. Remove the injector connector and inspect wiring for damage.
  3. If necessary, replace the fuel injector and ensure proper installation.
  4. Reconnect the injector connector.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle for a few minutes.
• Check for any leaks or abnormal noises.