how to fix P0301 misfire code Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, anti-seize compound.
• Remove the ignition coil cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Remove the old spark plug using the spark plug socket.
• Inspect the spark plug for damage; if faulty, install a new spark plug.
• Apply anti-seize compound on the threads of the new spark plug (if applicable).
• Torque the new spark plug to the manufacturer's specifications (typically around 22 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil appears faulty during inspection, remove it from the engine.
• Install a new ignition coil, ensuring it fits snugly in the spark plug hole.
• Torque the ignition coil bolts to specifications (usually around 8 lb-ft).
• Reconnect the electrical connector to the ignition coil.

4. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller, socket set, torque wrench.
• Disconnect the negative battery terminal again.
• Relieve fuel pressure from the fuel system by removing the fuel pump fuse and starting the engine until it stalls.
• Remove the fuel rail and carefully pull out the fuel injector from cylinder 1.
• Inspect the injector for clogs; clean or replace as needed.
• Reinstall the injector, ensuring it clicks into place, and reattach the fuel rail.
• Reconnect the fuel pump fuse and negative battery terminal.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Record the compression reading; it should match the manufacturer’s specifications (typically around 150-200 psi).
• If low compression is observed, further diagnosis of the cylinder may be necessary (e.g., valve seals, piston rings).