how to fix the P0300 code on my Tesla Model S Plaid/Refresh (2021-present)

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 in a safe working environment with the parking brake engaged.
• Disconnect the high-voltage battery to ensure safety.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connectors and remove the coils.
• Remove the spark plugs using the appropriate spark plug socket.
• Inspect each spark plug for wear or damage. Replace if necessary.
• Apply dielectric grease to the new spark plug threads and install them to the manufacturer’s torque specifications (typically around 18 ft-lbs).
• Reinstall the ignition coils and reconnect the electrical connectors.

3. Check and Replace Ignition Coils (if needed)

• Tools Required: Socket set, torque wrench.
• If misfires persist, check the ignition coils for proper operation.
• Remove the faulty ignition coil(s) identified during diagnostics.
• Install new ignition coil(s) ensuring they are seated properly.
• Torque the ignition coil bolts to the manufacturer's specifications.

4. Fuel Injector Inspection (if needed)

• Tools Required: Fuel pressure gauge, socket set.
• If the issue persists, check the fuel injectors for clogs or faults.
• Remove the fuel rail to access the injectors.
• Inspect and clean the fuel injectors or replace them if defective.
• Reinstall the fuel rail and ensure all connections are secure.