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

Solution

1. Preparation

• Gather tools and parts for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts or shocks.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil bolt using a socket and ratchet, then carefully pull the ignition coil out.
• Inspect the spark plug for wear; if it appears fouled or worn, remove it using a spark plug socket.
• Replace the spark plug with a new one, ensuring it is gapped according to manufacturer specifications.
• Apply dielectric grease to the ignition coil boot, then reinstall the ignition coil and secure it with the bolt.

3. Check and Replace Fuel Injector (if necessary)

• Tools Required: Ratchet, socket set, fuel injector puller (if required).
• Disconnect the fuel injector electrical connector.
• Remove any retaining clips or bolts securing the fuel rail if needed.
• Carefully pull the fuel injector out of the rail.
• Inspect the fuel injector for clogs or damage; replace if necessary.
• Install the new fuel injector, ensuring it is seated correctly in the rail.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine a few times to get a reading, and compare it to the manufacturer's specifications.
• If compression is low, further diagnostics may be required (e.g., checking for valve issues).

5. Reassemble and Reconnect Battery

• Replace any engine cover removed during repairs.
• Reconnect the battery terminals securely.