how to troubleshoot P0301 misfire code on Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather tools and parts.
• Park the vehicle on a level surface, engage the parking brake, and disconnect the negative battery terminal.

Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, compression tester, fuel injector tester.

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector.
  • Unscrew the mounting bolts and lift the coil out.
• Remove the spark plug using a spark plug socket:
  • Turn counterclockwise until free.
• Inspect the old spark plug for wear or fouling. Replace with a new spark plug (gapped according to manufacturer specifications).
• Reinstall the spark plug and torque to manufacturer's specification (usually around 13-16 lb-ft).
• Reinstall the ignition coil, ensuring it is seated properly.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was found to be faulty during inspection:
  • Remove the faulty ignition coil as described above.
  • Install the new ignition coil, ensuring proper alignment and connection.
  • Torque the mounting bolts to the specified value (usually around 7-10 lb-ft).

4. Test Fuel Injector

• If the injector was found to be faulty:
  • Remove the fuel injector connector.
  • Test the injector resistance with a multimeter; it should match manufacturer specifications (usually around 12-16 ohms).
  • If necessary, replace the fuel injector:
    • Remove the fuel rail (if applicable).
    • Replace the injector and ensure it is seated properly.
    • Reconnect all necessary components and connectors.

5. Reassemble and Clear Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the trouble codes.
• Start the engine and allow it to reach operating temperature.