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

Solution

1. Preparation

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

2. Replace Ignition Coil and Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from the coil for cylinder 1.
• Unscrew and remove the ignition coil using the socket set.
• Remove the spark plug using the spark plug socket, and inspect it for wear (replace if necessary).
• Install the new spark plug, torquing it to manufacturer specifications (usually around 20 Nm).
• Apply dielectric grease to the new ignition coil connector and install it in place.
• Reconnect the ignition coil connector.

3. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, cleaning kit.
• Disconnect the fuel line from the injector and the electrical connector.
• Remove the fuel injector from the intake manifold or rail.
• Clean the injector using a specialized fuel injector cleaning kit.
• Reinstall the cleaned or new injector and reconnect the fuel line and electrical connector.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the ignition coil and spark plug again for cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine several times to record the compression reading.
• Compare the readings with the manufacturer's specifications (usually around 120-200 psi).