how to fix P0300 random misfire code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0300 random 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 on a flat surface and the parking brake is engaged.
• Disconnect the vehicle from any charging source.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, dielectric grease, replacement ignition coils, and spark plugs.
• Sub-steps:
  1. Remove the engine cover by unscrewing any retaining bolts.
  2. Disconnect the electrical connectors from each ignition coil.
  3. Remove the ignition coils by unscrewing them from the cylinder head.
  4. Extract the spark plugs using a spark plug socket. Inspect for wear or carbon buildup.
  5. Install new spark plugs, ensuring proper torque (typically 12-15 Nm).
  6. Apply dielectric grease to the terminals of the new ignition coils and install them.
  7. Reconnect the electrical connectors and secure the engine cover back in place.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and fuel pressure test port.
  2. Connect the fuel pressure gauge to the test port.
  3. Start the vehicle and monitor the fuel pressure readings.
  4. If the pressure is below specification (consult manufacturer guidelines), inspect the fuel pump and filter for clogs or failures.