how to fix P0304 misfire code in my Tesla Outback 5th Generation (2015-2019)

Learn how to diagnose and fix P0304 cylinder 4 misfire in Tesla Outback. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to ensure safety.
• Allow the engine to cool down before starting any work.

2. Remove Ignition Coil and Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Unplug the electrical connector from the ignition coil for cylinder 4.
• Use the socket set to remove the ignition coil bolt and carefully pull the coil out.
• Use the spark plug socket to remove the spark plug from cylinder 4.

3. Inspect and Replace Components

• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary with a spark plug that meets manufacturer specifications (typically NGK or Denso).
• Test the ignition coil with a multimeter to check for proper resistance. If faulty, replace it with a new ignition coil.
• Check the fuel injector for cylinder 4; if clogged, clean or replace as needed.

4. Reassemble

• Install the new or inspected spark plug into cylinder 4 and torque it to manufacturer specifications (usually around 13-20 ft-lbs).
• Reinstall the ignition coil, securing it with the bolt and reconnecting the electrical connector.
• Replace the engine cover if removed.

5. Clear Codes and Test Drive

• Reconnect the negative battery cable.
• Use the OBD-II scanner to clear the P0304 code.
• Test drive the vehicle to verify that the misfire has been resolved.