my Volkswagen Golf MK6 (2009-2014) has a check engine light and P0301 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent any electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable (using a socket set).
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1 (using a socket).
• Remove the spark plug from cylinder 1 using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary (use OEM or equivalent parts).
• Install the new spark plug and torque it to manufacturer specifications (usually around 20-25 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil

• If the ignition coil appears damaged or if the spark plug was fine, replace the ignition coil for cylinder 1.
• Pull out the old ignition coil and install the new one, ensuring it is seated correctly.
• Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel rail if necessary (ensure fuel pressure is relieved first).
• Remove the fuel injector from cylinder 1.
• Inspect the injector for clogs; clean or replace if necessary.
• Reinstall the fuel injector and ensure it is properly seated.

5. Final Assembly

• Reinstall any components removed during disassembly.
• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes.