how to fix P0301 code for my BMW 3 Series G20/G21 (2019-2024)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical issues.
• Allow the engine to cool before starting work.

2. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the engine cover (if applicable).
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil using a socket wrench.
• Install a new ignition coil by reversing the removal process, ensuring it is seated properly.
• Torque the ignition coil bolt to the specified torque (typically around 10 Nm).

3. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench.
• Remove the ignition coil again to access the spark plug.
• Using a spark plug socket, remove the spark plug from cylinder 1.
• Inspect the old spark plug for signs of wear or fouling. Replace it with a new one, ensuring the gap is set to manufacturer specifications (usually around 0.028-0.032 inches).
• Torque the new spark plug to the manufacturer’s specification (typically around 25 Nm).

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector puller (if necessary), cleaning solvent.
• Disconnect the fuel injector electrical connector and fuel line.
• Remove the fuel injector from cylinder 1.
• If cleaning, soak the injector in a cleaning solvent and use an injector cleaning kit to flush it.
• If replacing, install the new fuel injector, ensuring proper O-ring seating.
• Reconnect the electrical connector and fuel line.

5. Check for Vacuum Leaks

• Inspect all hoses and gaskets around the intake manifold for any cracks or breaks.
• Use a smoke machine or carburetor cleaner to check for leaks around the intake manifold.
• Repair or replace any faulty hoses or gaskets as necessary.