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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Spark Plug

1. Remove Engine Cover: If applicable, remove any engine cover to access the ignition components.
   • Tools Required: Socket set, torque wrench
2. Remove Spark Plug: Use a spark plug socket to remove the spark plug from cylinder 2.
   • Inspect the plug for fouling or wear.
3. Install New Spark Plug: Install a new spark plug, ensuring it meets manufacturer specifications for gap and torque (typically around 15 lb-ft).
   • Tools Required: Torque wrench, spark plug socket

3. Replace Ignition Coil

1. Remove Ignition Coil: Disconnect the electrical connector and remove the mounting bolts holding the ignition coil in place.
   • Tools Required: Socket set
2. Install New Ignition Coil: Place the new ignition coil onto the spark plug and secure it with bolts. Reconnect the electrical connector.
   • Ensure the coil is seated properly.

4. Inspect and Clean Fuel Injector

1. Remove Fuel Injector: Disconnect the fuel line and electrical connector, then remove the retaining clip and pull the injector out.
   • Tools Required: Fuel line disconnection tool, socket set
2. Clean or Replace Injector: Clean the injector with appropriate cleaning solvent or replace it with a new part if damaged.
   • Reinstall the injector, ensuring proper seating and reattach the electrical connector and fuel line.

5. Check Compression

1. Remove Spark Plug Again: Revisit the spark plug area after completing previous steps.
2. Use Compression Tester: Insert a compression tester into cylinder 2 and crank the engine to measure compression.
   • Compare readings against manufacturer specifications (usually around 180-200 psi).
3. Assess Results: If low compression is found, further investigation on internal engine components may be needed.