how to diagnose a P0302 code on Volkswagen Golf MK6 (2009-2014)

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts while working on the vehicle.

2. Inspect and Replace Ignition Components

• Spark Plug Replacement

  • Remove the ignition coil from cylinder 2 by unscrewing any mounting bolts.
  • Disconnect the electrical connector from the ignition coil.
  • Remove the spark plug using a spark plug socket and ratchet.
  • Inspect the spark plug for wear or damage and replace it if necessary (OEM specifications: NGK PZFR6F-11, gap .032 inches).

• Ignition Coil Replacement

  • If the spark plug appears fine, inspect the ignition coil for cracks or carbon tracking.
  • If faulty, replace the ignition coil with a new one (OEM part recommended).

3. Fuel Injector Testing and Replacement

• Fuel Injector Inspection
  • Disconnect the fuel injector connector for cylinder 2.
  • Perform a resistance test using a multimeter; it should meet manufacturer specifications.
  • If the injector is faulty, replace it with a new injector (OEM part recommended).

4. Compression Test

• Testing Cylinder Compression
  • Remove the spark plug from cylinder 2.
  • Insert a compression tester into the spark plug hole and crank the engine several times.
  • Compare the reading to manufacturer specifications (typically 150-200 psi). If low, further diagnosis of mechanical issues (like valve or piston damage) may be needed.

5. Reassemble and Test Drive

• Reinstall all components in reverse order, ensuring all connections are secure.
• Reconnect the battery.
• Start the engine and check for any diagnostic codes. Perform a test drive to verify that the misfire has been resolved.