how to fix P0301 misfire code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is on a level surface and the engine is cool before starting.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if necessary using a socket set.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil using a ratchet and socket.
  4. Unscrew the spark plug using a spark plug socket.
  5. Inspect the old spark plug for wear; replace it with a new spark plug if necessary (recommended gap as per manufacturer specifications).
• Tools Required: Socket set, spark plug socket, torque wrench.
• Safety Warnings: Wear gloves and safety goggles to protect from debris.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Remove the ignition coil from cylinder 1 as previously described.
  2. Inspect the ignition coil for damage or carbon tracking.
  3. Install a new ignition coil and ensure it is seated properly.
  4. Reconnect the ignition coil connector.
• Tools Required: Socket set.
• Safety Warnings: Ensure the ignition system is de-energized before handling.

4. Fuel Injector Testing and Replacement

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a fuel injector tester to check for proper operation.
  3. If the injector is faulty, remove it using a fuel injector puller.
  4. Install a new fuel injector and reconnect the connector.
• Tools Required: Fuel injector puller, fuel injector tester.
• Safety Warnings: Relieve the fuel system pressure before servicing fuel injectors.

5. Final Assembly and Testing

• Sub-steps:
  1. Reinstall any components removed during the repair (engine cover, etc.).
  2. Reconnect the vehicle battery if it was disconnected.
  3. Start the engine and allow it to idle, monitoring for any misfire symptoms.
• Tools Required: Socket set.
• Safety Warnings: Ensure tools are cleared from the engine bay before starting the engine.