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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to ensure safety during the repair process.

2. Replace Spark Plug

• Remove the ignition coil by unscrewing the retaining bolts and gently pulling it out.
• Remove the old spark plug using a spark plug socket and ratchet.
• Inspect the spark plug gap and compare it with manufacturer specifications; if incorrect, replace with a new spark plug.
• Install the new spark plug and torque it to the manufacturer’s specified value (typically around 20 Nm).

3. Replace Ignition Coil

• If the ignition coil was found to be faulty during diagnostics, replace it.
• Install a new ignition coil onto the spark plug and secure it with the retaining bolts.
• Reconnect the electrical connector to the ignition coil.

4. Check Fuel Injector

• If the fuel injector was found to be faulty, remove it from the engine.
• Clean any debris around the injector port before removal.
• Install a new fuel injector and ensure it is seated correctly.
• Reconnect the electrical connector to the fuel injector.

5. Reassemble and Test

• Reconnect the vehicle battery.
• Start the engine and allow it to reach operating temperature.
• Monitor for any check engine light re-illumination and ensure the engine runs smoothly.