what to do if my Volkswagen Golf MK7.5 (2020-Present) has a check engine light and code P0301?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, torque wrench
• Ensure the vehicle is parked on a level surface and the engine is cool. Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug from cylinder 1.
• Inspect the old spark plug for signs of wear, such as fouling or excessive gap.
• Install a new spark plug with the correct gap as specified in the manufacturer’s manual.
• Torque the spark plug to the manufacturer’s specified value (usually around 20 Nm).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil using a socket wrench.
• Install a new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector.

4. Check or Replace Fuel Injector

• If the injector is suspected to be faulty, remove the fuel rail.
• Disconnect the electrical connector from the fuel injector for cylinder 1.
• Remove the injector using the appropriate tool.
• Install a new fuel injector and reconnect the electrical connector and fuel rail.

5. Reassemble and Reconnect

• Reinstall any components removed during the repair (e.g., engine cover).
• Reconnect the negative battery terminal.