how to fix the P0301 misfire code on my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and parts.
• Ensure the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Remove the engine cover if necessary.
• Use a socket set to remove the spark plug from cylinder 1.
• Inspect the old spark plug for wear; replace it with a new spark plug of the correct specifications (consult the owner’s manual).
• Torque the new spark plug to the manufacturer-recommended specification (typically around 20-30 Nm).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the mounting bolt(s) securing the ignition coil using a socket set.
• Carefully pull out the ignition coil from the spark plug well.
• Install the new ignition coil, ensuring it sits fully in the cylinder head.
• Reattach the electrical connector and secure the coil with the mounting bolt(s).

4. Inspect and Clean Fuel Injector

• If testing indicates a faulty fuel injector, remove it by disconnecting the electrical connector and fuel line.
• Use a fuel injector cleaner or ultrasonic cleaner to clean the injector.
• Reinstall the fuel injector, ensuring a proper seal and connection.

5. Perform Compression Test (if necessary)

• Remove the spark plug from cylinder 1 again.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading; compare it with the manufacturer’s specifications.
• If compression is low, further investigation into internal engine components may be needed.