how to fix the P0300 code on a Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, Tesla service tool.
• Ensure the vehicle is in a safe position and powered off.
• Disconnect the 12V battery for safety.

2. Inspect and Replace Ignition Coils

1. Remove Engine Cover (if applicable)
   • Use a socket set to remove any fasteners securing the engine cover.
2. Access Ignition Coils
   • Locate ignition coils on the engine; they are typically mounted on top of each cylinder.
3. Disconnect Electrical Connectors
   • Carefully detach the electrical connectors from each ignition coil.
4. Remove Ignition Coils
   • Use a socket set to unbolt the ignition coils and remove them from the engine.
5. Install New Ignition Coils
   • Place the new ignition coils in their respective positions and secure them with bolts. Torque the bolts to manufacturer specifications (typically around 10-15 ft-lbs).
6. Reconnect Electrical Connectors
   • Reattach the connectors to the new ignition coils.

3. Inspect and Replace Spark Plugs

1. Remove Spark Plugs
   • Use a spark plug socket to carefully unscrew and remove the spark plugs from the engine.
2. Inspect Old Spark Plugs
   • Check for signs of wear, fouling, or damage.
3. Install New Spark Plugs
   • Insert the new spark plugs, ensuring they are properly gapped (typically around 0.024-0.028 inches).
   • Torque the spark plugs to manufacturer specifications (usually around 15-20 ft-lbs).

4. Reconnect Battery and Test

1. Reconnect the 12V Battery
   • Ensure all connections are secure.
2. Clear Trouble Codes
   • Use the OBD-II scanner to clear any stored trouble codes.
3. Test Drive the Vehicle
   • Take the vehicle for a test drive to ensure the code does not reappear and to verify proper operation.