how to fix P0301 misfire code on BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, anti-seize compound.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector.
• Unbolt and remove the ignition coil from cylinder 1.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for wear and replace it with a new one, applying anti-seize compound to the threads.
• Torque the new spark plug to the manufacturer's specifications (usually around 22 Nm or 16 lb-ft).
• Reinstall the ignition coil and connector.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil is faulty, replace it.
• Tools Required: Socket set.
• Remove the ignition coil as described above.
• Install the new ignition coil and reconnect the electrical connector.

4. Test and Clean Fuel Injector (if necessary)

• If the fuel injector is found to be faulty, replace it.
• Tools Required: Fuel injector removal tool.
• Remove the fuel rail to access the injector.
• Replace the injector with a new one.
• Reconnect the fuel rail and check for leaks.

5. Perform Compression Test (if necessary)

• If compression is low, further investigation is required for potential internal engine issues.
• Tools Required: Compression tester.
• Remove spark plugs from all cylinders.
• Insert the compression tester into cylinder 1 and crank the engine.
• Compare the compression reading to the manufacturer’s specifications.