how to diagnose P0301 misfire code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the engine cover (if applicable) using a socket set.
  • Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
  • Remove the spark plug from cylinder 1 using a spark plug socket.
  • Inspect the spark plug for wear or fouling; replace if necessary.
  • Install a new spark plug, tightening to the manufacturer’s specified torque (usually around 12-15 ft-lbs).
  • Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector

• Sub-steps:
  • Locate the fuel rail and remove any necessary components for access.
  • Disconnect the fuel injector connector for cylinder 1.
  • Remove the fuel injector using a fuel injector puller or appropriate tool.
  • Inspect the injector for clogs, and replace if damaged or clogged.
  • Reinstall the new fuel injector, ensuring a proper seal and reconnect the electrical connector.

4. Verify and Reconnect

• Sub-steps:
  • Reconnect the battery terminal.
  • Start the vehicle and allow it to idle.
  • Ensure that the check engine light is off and monitor for any further misfire codes.