how to fix the misfire issue on my Volkswagen Passat B8 (2015-2022) with P0302 code?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, noid light, multimeter, basic hand tools.
• Ensure the engine is cool and disconnect the negative terminal of the battery before starting any repair work.

2. Inspect and Replace Spark Plug

1. Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
2. Extract the spark plug using a spark plug socket.
3. Inspect the spark plug for wear and carbon buildup; replace if necessary.
4. Gap the new spark plug according to manufacturer's specifications.
5. Install the new spark plug and torque to manufacturer specifications (typically 20-30 Nm).
6. Reinstall the ignition coil and secure with bolts.

3. Check and Replace Ignition Coil (if necessary)

1. If the spark plug is in good condition, test the ignition coil for proper resistance using a multimeter.
2. If the ignition coil is faulty, disconnect the wiring harness and remove the ignition coil.
3. Install a new ignition coil and reconnect the wiring harness.
4. Ensure all connections are secure.

4. Inspect and Test Fuel Injector

1. Connect a noid light to the injector connector to verify pulsing signal.
2. If there is no pulse, trace the wiring back to the ECM for faults.
3. If the injector is not functioning, disconnect it and replace it with a new one.
4. Reconnect the fuel injector connector and ensure it is secured.

5. Perform Compression Test

1. Remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine several times and record the compression reading.
4. Compare the reading to the manufacturer’s specifications. If low, further diagnosis may be required for internal engine problems.