what does it mean when my BMW X5 G05 (2019-2024) has a P0301 code?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet.
• Remove the ignition coil from cylinder 1.
  • Unplug the electrical connector.
  • Remove the mounting bolts and carefully pull the coil out.
• Remove the spark plug.
  • Use the spark plug socket to unscrew the spark plug from the cylinder head.
• Inspect the spark plug for signs of damage or fouling.
• If necessary, replace the spark plug with a new one that meets OEM specifications.
• Torque the new spark plug to the manufacturer-recommended specification (typically around 18-22 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil.
• If faulty, replace the ignition coil with an OEM or equivalent part.
  • Install the new coil and secure with bolts.
  • Reconnect the electrical connector.

4. Check Fuel Injector

• Inspect the fuel injector for cylinder 1.
  • Use a noid light to check if the injector is receiving the correct signal.
• If the injector is faulty, replace it with a new one.
  • Disconnect the fuel line and electrical connector.
  • Remove the injector and install the new one, ensuring it is seated properly.

5. Final Assembly and Testing

• Reconnect the negative battery terminal.
• Start the engine and check for smooth operation.
• Observe for any check engine lights or misfires.