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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shock and accidental short circuits.
• Allow the engine to cool completely before proceeding.

2. Replace Ignition Coil

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts.
• Install the new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector and apply dielectric grease to prevent moisture ingress.

3. Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, gap gauge.
• Remove the ignition coil (if not done previously) to access the spark plug.
• Use the spark plug socket to carefully remove the old spark plug.
• Inspect the spark plug for wear; replace if necessary.
• Set the gap on the new spark plug to the manufacturer's specifications using a gap gauge.
• Install the new spark plug and tighten it to the manufacturer’s torque specification (usually around 15-20 lb-ft).

4. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool, socket set.
• Disconnect the fuel line from the injector (use caution as fuel may spill).
• Remove the electrical connector from the fuel injector.
• Use a fuel injector removal tool to extract the injector from the engine.
• Inspect the injector for blockages and cleanliness. Replace if damaged.
• Install the new injector, ensuring it is secured and reattach the fuel line and electrical connector.