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

Solution

1. Preparation

• Gather all tools and parts required for the repair.
• Ensure the engine is cool and disconnect the battery to prevent electrical shorts.
• Tools Required: Socket set, Torque wrench, Spark plug socket, Compression tester, OBD-II scanner.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Use a spark plug socket to remove the old spark plug from cylinder 1.
• Inspect the new spark plug and ensure it is gapped correctly according to the manufacturer’s specifications.
• Install the new spark plug and torque it to 25 Nm (18 ft-lbs).
• Reinstall the ignition coil and secure it with the bolts. Reconnect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil was found to be defective during diagnostics, remove it by following the same steps as above.
• Install a new ignition coil and ensure it is seated properly.
• Torque the mounting bolts to 10 Nm (7 ft-lbs).

4. Inspect and Clean Fuel Injector (if necessary)

• Disconnect the fuel line and the electrical connector from the fuel injector for cylinder 1.
• Remove the fuel injector using a suitable tool and inspect it for clogs.
• Clean the fuel injector using a fuel injector cleaner or replace it if necessary.
• Reinstall the fuel injector and reconnect the fuel line and electrical connector.

5. Perform Compression Test (if necessary)

• Remove the spark plug from cylinder 1 and connect the compression tester.
• Crank the engine to obtain a compression reading.
• Compare the reading against the manufacturer’s specifications (usually around 200 psi).
• If the compression is low, further investigation may be needed for potential internal engine issues.