how to fix P0302 misfire code in my Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

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

2. Replace Spark Plug and Ignition Coil

1. Remove the engine cover if applicable.
2. Locate the ignition coil on cylinder 2.
3. Disconnect the electrical connector from the ignition coil.
4. Remove the mounting bolts of the ignition coil using a socket set.
5. Pull the ignition coil out of the spark plug well.
6. Remove the spark plug using a spark plug socket.
7. Inspect the old spark plug for signs of wear or fouling.
8. Install the new spark plug, tightening to manufacturer specifications (typically around 20 ft-lbs).
9. Reinstall the ignition coil, securing it with bolts, and reconnect the electrical connector.

3. Inspect and Test Fuel Injector

1. Locate the fuel injector for cylinder 2.
2. Disconnect the electrical connector from the injector.
3. Use a noid light or multimeter to check for proper voltage and signal to the injector.
4. If the injector is faulty, remove and replace it, ensuring to torque it to manufacturer specifications.

4. Check for Vacuum Leaks

1. Inspect all hoses and gaskets around the intake manifold for cracks or disconnections.
2. If necessary, use propane or carburetor cleaner to test for vacuum leaks while the engine is running.

5. Compression Test (if misfire persists)

1. Remove the spark plug from cylinder 2.
2. Insert a compression gauge into the spark plug hole.
3. Crank the engine several times and note the compression reading.
4. Compare the reading to the specifications for the engine (typically around 150-200 psi). If low, further engine diagnosis is required.