how to fix the P0301 code in my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the ignition coil cover (if applicable) to access the spark plug.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug for wear; replace if necessary.
• Apply dielectric grease to the threads of the new spark plug.
• Install the new spark plug and torque it to the manufacturer's specification (typically around 22 ft-lbs).

3. Replace Ignition Coil

• Tools Required: Socket set.
• Disconnect the electrical connector from the ignition coil in cylinder 1.
• Remove the ignition coil by unscrewing it from the cylinder head.
• Install the new ignition coil and reconnect the electrical connector.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injector.
• If cleaning, remove the fuel injector from cylinder 1 and follow the cleaning kit instructions.
• If replacing, disconnect the fuel line and electrical connector from the injector, then remove it from the rail.
• Install the new or cleaned injector and reconnect the fuel line and connector.

5. Final Checks

• Reconnect the battery and clear the error codes using the OBD-II scanner.
• Start the engine and let it idle to check for any misfires.