why does my Tesla Model S Original (2012-2020) have a check engine light and is showing P0300

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

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect and Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench, gap gauge
• Remove the ignition coil cover (if applicable).
• Use the spark plug socket to remove the old spark plugs.
• Inspect the old plugs for wear; replace with OEM or high-quality compatible plugs if necessary.
• Set the gap on the new spark plugs according to manufacturer specifications (typically around 0.030-0.040 inches).
• Install the new spark plugs and torque them to the manufacturer's specifications (usually around 15-22 lb-ft).

3. Check and Replace Ignition Coils

• Tools Required: Socket set, torque wrench
• Remove the ignition coils by disconnecting the electrical connectors and unscrewing them from the engine.
• Inspect each coil for signs of damage or overheating.
• Replace any faulty ignition coils with OEM parts.
• Reinstall the ignition coils, ensuring proper torque (usually around 7-10 lb-ft).

4. Fuel Injector Inspection

• Tools Required: Fuel injector cleaning kit or replacement injectors
• Remove the fuel rail to access the injectors.
• Inspect fuel injectors for clogs; clean with a fuel injector cleaning kit if necessary.
• Replace any defective injectors with OEM parts if cleaning does not restore function.
• Reinstall the fuel rail and ensure all connections are secure.

5. Vacuum Leak Inspection

• Tools Required: Smoke machine or carburetor cleaner
• Use a smoke machine to check for vacuum leaks around intake manifold gaskets and vacuum lines.
• Alternatively, spray carburetor cleaner around suspected areas; if the RPM changes, a leak is present.
• Replace any damaged vacuum lines or gaskets found during inspection.