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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the engine cover if applicable.
• Disconnect the ignition coils from the spark plugs.
• Using a spark plug socket, remove the old spark plugs.
• Inspect the old plugs for wear or carbon buildup.
• Install new spark plugs, torquing them to the manufacturer’s specifications (typically 15-20 Nm).
• Reconnect the ignition coils.

3. Check and Replace Ignition Coils

• If the spark plugs are in good condition, proceed to check the ignition coils.
• Disconnect the electrical connector and remove the ignition coil.
• Test the coil using a multimeter for proper resistance values (refer to the specification).
• Replace any faulty coils with new ones, ensuring they are properly seated.

4. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if applicable)
• Locate the fuel rail and inspect the fuel injectors for any signs of leakage or clogging.
• If cleaning is needed, follow the instructions for the fuel injector cleaning kit.
• Replace any injectors that are damaged or not functioning properly.

5. Check for Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold.
• Use a smoke machine or carburetor cleaner to detect any leaks during a running test.
• Repair or replace any damaged hoses or connections.