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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, gap gauge.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and gently pulling it out.
• Use the spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or damage; replace it if necessary.
• Check the gap using a gap gauge and adjust to manufacturer specifications (typically around 0.028-0.032 inches).
• Install the new or inspected spark plug and torque to manufacturer specifications (usually around 18-22 ft-lbs).
• Reinstall the ignition coil and secure it with bolts.

3. Inspect and Replace Ignition Coil

• Tools Required: Ratchet and socket set.
• If the ignition coil was found defective, remove it using the ratchet and socket.
• Install a new ignition coil for cylinder 1, ensuring it is seated properly.
• Connect the electrical connector securely.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (optional).
• If the fuel injector is clogged, remove it from cylinder 1 following the manufacturer's instructions.
• Clean the injector using a fuel injector cleaning kit or replace it if it is malfunctioning.
• Reinstall the cleaned or new fuel injector, ensuring it is properly seated.

5. Check for Vacuum Leaks

• Visually inspect all hoses and connections around the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner spray around the intake area while the engine is running to identify leaks.
• Repair or replace any damaged hoses or gaskets found during the inspection.