my Tesla Model S Plaid/Refresh (2021-present) has a P0300 misfire code how do I fix it

Learn how to diagnose and fix P0300 engine misfire in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector.
  3. Remove the ignition coil using a socket set.
  4. Extract the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear or carbon buildup; replace if necessary.
  6. Install new spark plugs according to manufacturer specifications, using a torque wrench to tighten to the specified torque (typically around 18 lb-ft for Tesla).
  7. Reinstall the ignition coil and reconnect the connector.

3. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail assembly, following proper procedures to avoid fuel spillage.
  2. Inspect each injector for clogging or damage.
  3. Clean or replace any faulty injectors.
  4. Reinstall the fuel rail and ensure all connections are secure.

4. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to test for leaks around the intake manifold.
  3. Repair or replace any damaged hoses or gaskets as needed.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0300 code.
  3. Start the engine and monitor for any reoccurrence of the misfire code.