how to resolve P0301 misfire code on my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 1 by unscrewing the bolts and gently pulling it out.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for signs of wear, fouling, or damage.
• If needed, replace with a new spark plug (specification: NGK or Bosch equivalent).
• Reinstall the spark plug and torque to the manufacturer's specification (typically 22 lb-ft).

3. Check and Replace Ignition Coil

• Inspect the ignition coil for physical damage or burn marks.
• If faulty, replace the ignition coil with a new one (ensure it matches the OEM part number).
• Reconnect the ignition coil connector securely.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector from cylinder 1 by disconnecting the electrical connector and fuel line.
• Check for clogs or leaks in the fuel injector.
• Clean the injector using a professional cleaning solution if needed or replace it if it's defective.

5. Compression Test

• Remove the spark plugs from all cylinders for accurate testing.
• Connect a compression gauge to cylinder 1 and crank the engine.
• Record the compression reading and compare it to the manufacturer's specifications (typically between 150-200 psi).
• If compression is low, further investigation into piston rings or valves may be required.