how to resolve the P0301 misfire code in BMW 5 Series G30/G31 (2017-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Allow the engine to cool completely before beginning work.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the ignition coil on cylinder 1.
• Use a socket set to remove the ignition coil.
• Remove the old spark plug using a spark plug socket.
• Install the new spark plug, ensuring it is torqued to the manufacturer’s specification (typically around 25 Nm).
• Reinstall the ignition coil and reconnect any electrical connectors.

3. Inspect and Replace Ignition Coil (if necessary)

• If the spark plug inspection reveals no issues, test the ignition coil for resistance and functionality with a multimeter.
• If faulty, replace the ignition coil with a new one, following the same removal and installation steps as above.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Perform a resistance test using a multimeter; typical values should be around 12-16 ohms.
• If the injector is faulty, remove it using an injector puller tool (if necessary) and replace it with a new one.

5. Compression Test (if misfires persist)

• Use a compression gauge to check the compression of cylinder 1.
• If the compression is below the manufacturer's specifications, further investigation may be needed, including checking for valve issues or head gasket failure.