how to fix P0301 misfire code in my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is on a flat surface and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil by unbolting it and disconnecting the electrical connector.
• Unscrew the old spark plug using the spark plug socket.
• Inspect the spark plug gap; replace with a new spark plug if needed.
• Install the new spark plug and torque it to the manufacturer's specifications (usually around 22 lb-ft).
• Reattach the ignition coil.

3. Inspect and Replace Ignition Coil (if necessary)

• Tools Required: Ratchet, socket set.
• Remove the ignition coil for cylinder 1 by unbolting it and disconnecting the connector.
• Test the ignition coil with a multimeter; if resistance is out of spec, replace it with a new coil.
• Install the new ignition coil and ensure it is seated properly.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, basic hand tools.
• Remove the fuel injector for cylinder 1 by disconnecting the fuel rail and electrical connector.
• Clean the injector using a fuel injector cleaning kit.
• Reinstall the fuel injector and reconnect all connections.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine to get the compression reading; compare with manufacturer specifications.
• If compression is low, further inspection of the engine components may be required (valves, piston rings).