how to troubleshoot a P0301 code in my Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1.
• Unscrew and remove the spark plug using the spark plug socket.
• Inspect the old spark plug: if fouled or damaged, replace it with a new spark plug.
• Install the new spark plug, ensuring it is torqued to the manufacturer's specification (typically around 20-25 Nm).
• Reinstall the ignition coil.

3. Inspect/Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, remove the ignition coil from cylinder 1.
• Inspect for cracks or wear in the ignition coil.
• If damaged, replace the ignition coil with a new one.
• Reinstall the ignition coil securely and reconnect the wiring harness.

4. Test Fuel Injector

• Use a multimeter to check the resistance of the fuel injector for cylinder 1; it should match the manufacturer's specifications (usually around 12-16 ohms).
• If the injector is faulty, replace it with a new fuel injector.
• Reconnect the fuel injector connector and ensure proper seating.

5. Final Checks

• Reconnect the negative battery terminal.
• Clear any stored trouble codes using the OBD-II scanner.
• Start the vehicle and allow it to reach operating temperature.