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

Solution

1. Preparation

• Gather tools and components required for repairs.
• 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

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolt and gently pulling it out.
• Remove the old spark plug using a spark plug socket.
• Inspect the spark plug gap and ensure it is within manufacturer specifications (typically around 0.028-0.031 inches for most VW models).
• Install the new spark plug by hand, then use the torque wrench to tighten it to the manufacturer's specification (approximately 22 ft-lbs).
• Reinstall the ignition coil, ensuring it is seated properly and secured with the retaining bolt.

3. Replace Ignition Coil (if faulty)

• If the ignition coil was found to be faulty during inspection, replace it with a new one.
• Follow the same removal procedure as for the spark plug, and install the new ignition coil in reverse order.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaning kit (if applicable).
• Remove the fuel rail if necessary to access the injector.
• Use the fuel pressure gauge to check if the injector is delivering proper fuel pressure.
• Clean or replace the injector if it is not functioning correctly.

5. Address Mechanical Issues

• If the compression test indicated low compression in cylinder 1, further investigation is required. This may involve checking the cylinder head, piston rings, or valves.
• Repair any identified mechanical issues based on findings.