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

Solution

1. Preparation

• Gather tools and parts for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Replace Ignition Coil and Spark Plug

• Tools Required: Socket set, torque wrench, ratchet, extension, spark plug socket, and dielectric grease.
• Remove the engine cover if necessary to access the ignition components.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil by unscrewing the bolts and pulling it out.
• Extract the spark plug using a spark plug socket, and inspect it for wear or damage.
• Install a new spark plug, ensuring the gap is set to the manufacturer’s specification (typically around 0.028-0.032 inches).
• Apply dielectric grease to the rubber boot of the ignition coil before installing.
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Remove the electrical connector from the fuel injector on cylinder 1.
• Connect the noid light to the injector connector and crank the engine.
• Check if the light flashes, indicating that the injector is receiving a signal.
• If the injector does not pulse, replace the injector.

4. Check Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 to access the combustion chamber.
• Insert the compression tester into the spark plug hole.
• Crank the engine several times and record the compression reading.
• Compare the reading to the manufacturer's specifications. If it's low, further investigation into internal engine issues may be needed.

5. Inspect for Vacuum Leaks

• Visually inspect all vacuum lines and the intake manifold for cracks or disconnections.
• Use a smoke machine or carb cleaner to identify any leaks while the engine is running.
• Repair or replace any damaged components found during the inspection.