how to fix P0301 misfire code Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

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

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket.
• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the ignition coil connector.
  3. Remove the ignition coil using a socket wrench.
  4. Remove the spark plug using a spark plug socket.
  5. Inspect the old spark plug for signs of wear or fouling; replace if necessary.
  6. Install the new spark plug by hand to avoid cross-threading, then torque to manufacturer specifications (typically 20 Nm).
  7. Install the new ignition coil and reconnect the connector.

3. Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller, ratchet set, torque wrench.
• Sub-steps:
  1. Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
  2. Disconnect the fuel line from the injector rail (use a rag to catch any fuel).
  3. Remove the fuel rail bolts and carefully pull the rail away from the engine.
  4. Remove the injector from the rail.
  5. Install the new injector, ensuring it seats properly.
  6. Reattach the fuel rail and reconnect the fuel line, ensuring all connections are secure.

4. Reassemble and Test

• Reinstall any components removed during the process, including the engine cover.
• Reconnect the battery.
• Start the engine and allow it to idle, checking for any abnormal noises or symptoms.