how to fix P0301 code in my Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Remove the engine cover (if applicable) using a socket set.
• Locate and remove the spark plug wire or ignition coil for cylinder 1.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug gap and replace it with a new spark plug, ensuring the gap is set to the manufacturer's specifications (typically around 0.028-0.032 inches).
• Torque the new spark plug to the manufacturer’s specified value (usually around 15-20 lb-ft).

3. Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, proceed to test or replace the ignition coil.
• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the bolts securing the ignition coil and lift it out.
• Install the new ignition coil and secure it with bolts.
• Reconnect the electrical connector.

4. Test Fuel Injector

• If the misfire persists, test the fuel injector for cylinder 1.
• Remove the fuel injector connector and use a multimeter to check for proper resistance (typically between 12-16 ohms).
• If the injector is faulty, remove the fuel rail and replace the injector.
• Reinstall the fuel rail and reconnect the injector.

5. Compression Test

• If all previous steps do not resolve the issue, conduct a compression test.
• Remove the spark plug and insert the compression tester into cylinder 1.
• Crank the engine and record the pressure reading.
• Compare the result to the manufacturer's specifications (usually around 120-200 psi). If low, further investigation into internal engine issues may be required.