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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to prevent electrical shock.
• Allow the engine to cool down before working on it.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable by unscrewing any retaining bolts.
• Disconnect the ignition coil connector on cylinder 1.
• Remove the ignition coil by unbolting it and gently pulling it out.
• Remove the spark plug using a spark plug socket. Inspect for wear or damage.
• Install a new spark plug, torquing to the manufacturer's specification (typically 22 ft-lbs for most VW spark plugs).
• Install the new ignition coil, ensuring it is seated properly, and reconnect the electrical connector.

3. Test Fuel Injector

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector on cylinder 1.
• Connect a noid light to the fuel injector connector and crank the engine to check for proper pulse signal.
• If no signal is detected, check the wiring back to the ECU. If the signal is present, replace the fuel injector for cylinder 1.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Have an assistant crank the engine for several seconds while you take the reading.
• If the compression is below the manufacturer's specification (typically around 150 psi), further investigation is needed for internal engine issues.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carb cleaner.
• With the engine running, inspect the intake manifold and surrounding vacuum lines for leaks.
• If smoke is observed or the engine RPM changes when spraying carb cleaner, repair or replace the affected components.