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

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 ensure safety.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate the ignition coil for cylinder 1 (usually near the front of the engine).
3. Disconnect the ignition coil electrical connector.
4. Remove the ignition coil using a socket wrench.
5. Remove the spark plug using a spark plug socket and ratchet.
6. Inspect the spark plug for fouling, wear, or damage. Replace with a new spark plug if necessary (gap as per manufacturer specifications).
7. Reinstall the spark plug and ignition coil, tightening to the manufacturer's torque specification (usually around 15 Nm for spark plugs).

3. Inspect and Replace Ignition Coil

1. If the spark plug is in good condition but the misfire persists, replace the ignition coil.
2. Remove the ignition coil as previously described.
3. Install the new ignition coil, ensuring it is seated properly.
4. Reconnect the ignition coil electrical connector.

4. Inspect and Test Fuel Injector

1. If the issue continues, test the fuel injector for cylinder 1.
2. Remove the electrical connector from the fuel injector.
3. Use a noid light to check for signal; if there is no pulse, the injector may be faulty.
4. Replace the fuel injector if necessary, following the manufacturer’s specifications for installation.

5. Final Checks

1. Reconnect the negative battery terminal.
2. Clear any diagnostic trouble codes using the OBD-II scanner.
3. Start the engine and allow it to idle, checking for smooth operation.