how to fix the P0301 code in my BMW X3 G01 (2018-2024)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable) to access the spark plugs.
• Remove the spark plug from cylinder 1 using the spark plug socket.
• Inspect the spark plug for wear and carbon buildup; replace if necessary with OEM-spec spark plug.
• Torque the new spark plug to the manufacturer's specifications (usually around 22 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set.
• Disconnect the ignition coil connector and remove the mounting bolts.
• Remove the ignition coil from cylinder 1.
• Inspect for cracks or damage; replace if necessary with OEM ignition coil.
• Reinstall the new ignition coil and connect the electrical connector.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if necessary).
• Disconnect the fuel line leading to the injector and the electrical connector.
• Remove the fuel injector from cylinder 1.
• Check for clogs and clean the injector using a fuel injector cleaning kit.
• Reinstall the cleaned or new injector and reconnect all lines and connectors.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine several times.
• Compare the compression reading to the manufacturer's specifications (typically around 180-220 PSI).
• If the compression is low, further inspection of the piston rings or valve seals may be required.