how to diagnose a P0300 misfire code on Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0300 engine misfire in Tesla Model S (2012-2020). 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 level surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Replace Spark Plugs

• Remove the engine cover (if applicable).
• Disconnect the ignition coils by unclipping the connectors.
• Remove the ignition coils using a socket and ratchet.
• Unscrew and remove the old spark plugs using a spark plug socket.
• Install new spark plugs, ensuring they are torqued to the manufacturer's specifications (typically around 15-20 lb-ft).
• Reinstall the ignition coils and connectors.

3. Replace Ignition Coils (if needed)

• If faulty ignition coils were identified, remove the old coils as described above.
• Install new ignition coils, ensuring they are seated properly and connected securely.
• Reconnect the battery and ensure all electrical connections are intact.

4. Address Fuel System Issues

• If fuel injectors are clogged, remove and clean them using a fuel injector cleaning kit or replace them if necessary.
• Verify fuel pressure with a fuel pressure gauge, ensuring it meets manufacturer specifications (typically around 50-60 psi).

5. Inspect and Clean Air Intake

• Check for vacuum leaks by inspecting hoses and gaskets.
• Clean the throttle body using a throttle body cleaner if carbon buildup is present.