how to fix P0300 misfire code in 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.
• Disconnect the 12V battery for safety.
• Ensure the vehicle is on a flat surface and secured with wheel chocks.

2. Inspect and Replace Ignition Coils

• Tools Required: Socket set, torque wrench.
• Remove the engine cover if present.
• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coil bolts and carefully extract the coils.
• Inspect the coils for cracks or damage.
• If any coils are defective, replace them with new parts.
• Torque the bolts to the manufacturer's specifications (typically around 10-12 Nm).

3. Inspect and Replace Spark Plugs

• Tools Required: Spark plug socket, torque wrench.
• Remove the ignition coils from the spark plugs (if not already done).
• Using a spark plug socket, carefully unscrew and remove the spark plugs.
• Inspect the spark plugs for wear or carbon buildup; replace if necessary.
• Install new spark plugs, ensuring to torque them to the specified value (usually around 25 Nm).

4. Inspect the Fuel System

• Tools Required: Fuel pressure gauge.
• Connect a fuel pressure gauge to the fuel rail service port.
• Turn the ignition on (do not start the engine) and check the fuel pressure.
• If pressure is outside the manufacturer’s specifications, inspect and replace the fuel pump or filter as needed.

5. Clear Codes and Conduct a Test Drive

• Reconnect the battery and use an OBD-II scanner to clear the error codes.
• Start the vehicle and let it idle for a few minutes to ensure no codes return.
• Take the vehicle for a short test drive under various driving conditions.