how to fix P0300 misfire code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the high-voltage battery to ensure safety.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover (if applicable).
• Use the spark plug socket to carefully remove the spark plugs.
• Inspect the spark plugs for wear; replace if necessary.
• Install new spark plugs, ensuring they are torqued to the manufacturer's specifications (typically 15-20 ft-lbs).

3. Check and Replace Ignition Coils

• Tools Required: Socket set, torque wrench
• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coils using the socket set.
• Inspect coils for signs of wear or damage; replace any faulty coils.
• Reinstall the new ignition coils, ensuring they are torqued to the manufacturer's specifications.

4. Inspect Fuel Injectors

• Tools Required: Fuel pressure gauge, injector cleaning kit
• Connect a fuel pressure gauge to the fuel rail to check for proper fuel pressure.
• Perform a fuel injector balance test using the injector cleaning kit to ensure all injectors are functioning properly.
• Clean or replace any faulty fuel injectors as necessary.

5. Check Air Intake and Vacuum Leaks

• Tools Required: Smoke machine (if available), vacuum gauge
• Inspect the air intake duct and throttle body for any blockages.
• Use a smoke machine to check for vacuum leaks in the intake system.
• Repair or replace any damaged hoses or components.