how to fix a check engine light for P0302 on my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner.
• Gather replacement parts, including a new spark plug, ignition coil, and fuel injector if needed.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.

2. Replace Spark Plug and Ignition Coil

1. Disconnect the battery to prevent electrical shorts.
2. Remove the engine cover if applicable.
3. Locate the ignition coil and spark plug for cylinder 2.
4. Unscrew the ignition coil using a socket wrench and carefully pull it out.
5. Remove the spark plug using a spark plug socket. Inspect for wear and replace if necessary.
6. Install the new spark plug and torque it to the manufacturer’s specifications (typically around 20-30 Nm).
7. Reinstall the ignition coil and torque it to specifications (around 10-15 Nm).

3. Inspect and Replace Fuel Injector (if necessary)

1. Disconnect the fuel injector connector.
2. Remove the fuel rail if needed, ensuring to relieve fuel pressure first by removing the fuel pump fuse and starting the engine until it stalls.
3. Remove the old fuel injector from the rail. Clean the injector ports.
4. Install the new fuel injector and ensure it is seated properly.
5. Reattach the fuel rail and reconnect the fuel pump fuse.

4. Test for Vacuum Leaks

1. Start the engine and listen for any hissing sounds indicating a vacuum leak.
2. Use a smoke machine or carburetor cleaner around the intake manifold and hoses to identify leaks.

5. Final Check

1. Reconnect the battery.
2. Clear the code using the OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved.