how to fix P0304 misfire code in Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

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

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the electrical connector from the ignition coil of cylinder 4.
  3. Remove the ignition coil using a socket wrench.
  4. Inspect the spark plug and replace it if worn or fouled (use spark plug socket).
  5. Install a new ignition coil and reconnect the electrical connector.
• Tools Required: Socket set, spark plug socket, ratchet.

3. Check and Replace Fuel Injector (if necessary)

• Sub-steps:
  1. Remove the fuel rail according to manufacturer specifications (may require a torque wrench).
  2. Disconnect the fuel injector electrical connector for cylinder 4.
  3. Remove the old fuel injector from the rail.
  4. Install the new fuel injector ensuring proper seating and sealing.
  5. Reassemble the fuel rail and reconnect all components.
• Tools Required: Torque wrench, fuel injector removal tool.

4. Perform Compression Test (if misfire persists)

• Sub-steps:
  1. Remove the spark plug from cylinder 4.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine to take a reading. Compare results to manufacturer specifications.
  4. If compression is low, further diagnosis is needed for internal engine components.
• Tools Required: Compression gauge.