how to fix P0304 code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil by unscrewing it from the cylinder head.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear, carbon deposits, or damage. Replace if necessary.
• Install the new spark plug and torque it to the manufacturer’s specification (typically around 22 lb-ft).
• Reinstall the ignition coil, ensuring it is seated correctly.

3. Inspect and Replace Ignition Coil

• If the spark plug looks good, test the ignition coil for proper operation using a multimeter.
• If faulty, remove the ignition coil and replace it with a new one.
• Ensure the coil is properly seated and reconnected.

4. Test Fuel Injector

• Remove the fuel injector from cylinder 4 for inspection.
• Check for clogs or leaks in the injector.
• If needed, replace the fuel injector with a new one.
• Reinstall the injector and ensure proper connections.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove all spark plugs.
• Insert the compression tester into cylinder 4's spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading with the manufacturer’s specifications. If low, further investigation into the engine’s internal components may be necessary.