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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable) to access the spark plugs.
• Remove the spark plug wire or ignition coil from cylinder 1.
• Using a spark plug socket, carefully unscrew the old spark plug and remove it from the cylinder head.
• Inspect the old spark plug for signs of wear; if it is worn, replace it with a new one.
• Install the new spark plug with the correct gap (consult specifications) and torque it to the manufacturer’s specifications (typically around 22 lb-ft).
• Reattach the ignition coil or spark plug wire.

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil from cylinder 1 by unbolting it from the engine.
• Disconnect the electrical connector from the ignition coil.
• Install the new ignition coil, ensuring it is seated properly in the spark plug well.
• Reconnect the electrical connector and secure the ignition coil with the appropriate fasteners (torque to manufacturer’s specifications).

4. Test Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter.
• Disconnect the fuel injector connector from cylinder 1.
• Use a multimeter to check the resistance of the injector; compare it with the specifications in the service manual.
• If the injector is faulty, replace it by removing the fuel rail and replacing the injector with a new component.
• Reattach the fuel rail and reconnect the injector connectors once the replacement is complete.

5. Perform Compression Test (if necessary)

• Tools Required: Compression tester.
• Remove spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading and compare it to the manufacturer’s specifications (typically 180-200 psi).
• If the reading is low, further diagnosis of the internal engine components may be required (valves, piston rings).