how to fix the P0301 misfire code in my Volkswagen Golf MK7.5 (2020-Present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from the spark plug.
• Remove the ignition coil from cylinder 1.
• Extract the spark plug using a spark plug socket.
• Inspect the spark plug for wear (electrode condition, carbon build-up, etc.).
• Replace the spark plug if worn or fouled. Torque the new spark plug to the manufacturer’s specifications (typically around 20-25 Nm).

3. Inspect and Replace Ignition Coil

• If the spark plug is fine, test the ignition coil.
• Tools Required: Multimeter.
• Check the resistance of the ignition coil with a multimeter (specifications can vary; refer to the service manual).
• If the ignition coil is faulty, replace it with a new one.
• Reinstall the ignition coil and reconnect the electrical connector securely.

4. Test Fuel Injector

• If misfire persists, test the fuel injector for cylinder 1.
• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector and connect the noid light to the harness.
• Crank the engine to see if the noid light flashes (indicating injector pulse).
• If no pulse is detected, further investigate wiring or replace the fuel injector if necessary.

5. Compression Test

• Perform a compression test on cylinder 1 to ensure the engine is mechanically sound.
• Tools Required: Compression tester.
• Disconnect ignition coils and spark plugs.
• Insert the compression tester into the spark plug hole and crank the engine.
• Compare the compression readings to manufacturer specifications (typically around 180-220 psi).
• If compression is low, further engine diagnostics may be necessary.