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

Solution

1. Preparation

• Tools Required: OBD-II scanner, spark plug socket, torque wrench, multimeter, compression tester, vacuum gauge, basic hand tools.
• Disconnect the battery to prevent any electrical shorts during repairs.

2. Replace Spark Plug

1. Remove the engine cover (if applicable) by unscrewing any retaining bolts.
2. Locate the spark plug for cylinder 1 and remove the ignition coil by unscrewing the retaining bolt and gently pulling it out.
3. Use a spark plug socket to remove the old spark plug. Inspect it for wear or fouling.
4. Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (usually around 0.028 inches).
5. Torque the spark plug to the manufacturer's specifications (typically around 22 lb-ft).

3. Replace Ignition Coil

1. If the ignition coil appears damaged or has been tested and found faulty, replace it.
2. Remove the old ignition coil by pulling it straight out of the spark plug hole.
3. Install the new ignition coil, making sure it seats properly.
4. Reconnect the electrical connector and secure it with the retaining bolt.

4. Check Fuel Injector

1. Remove the fuel injector connector for cylinder 1.
2. Use a multimeter to check the resistance of the injector (should typically be around 12-16 ohms).
3. If the injector is faulty, replace it by removing it from the fuel rail and installing a new one.

5. Compression Test

1. Remove the spark plug for cylinder 1.
2. Attach a compression tester into the spark plug hole.
3. Crank the engine for a few seconds and note the pressure reading. It should be within the manufacturer’s specified range (usually around 150-200 psi).
4. If compression is low, further engine diagnosis may be necessary.