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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet.
• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Remove the old spark plug using a spark plug socket.
• Inspect the spark plug gap and condition; replace it with a new spark plug if needed.
• Torque the new spark plug to the manufacturer's specification (typically 22 lb-ft for VW).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, multimeter.
• If the misfire persists, remove the ignition coil from cylinder 4.
• Test the ignition coil with a multimeter to check for proper resistance.
• If faulty, replace the ignition coil with a new one.
• Reinstall the ignition coil and ensure it's securely connected.

4. Check Fuel Injector

• Tools Required: Fuel injector tester, noid light, or multimeter.
• Disconnect the fuel injector connector and test for voltage with a multimeter.
• If no signal is present, inspect the wiring and replace the fuel injector if it's not functioning.
• Reconnect the injector and ensure it fits securely.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 4 and insert the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer's specifications; if low, further investigate for potential mechanical issues.