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

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the vehicle's 12V battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug wires or connectors.
• Using a spark plug socket, carefully remove the spark plugs.
• Inspect the spark plugs for wear (e.g., electrode condition, color).
• Replace with OEM spark plugs, ensuring they are gapped correctly (refer to manufacturer specs).
• Reinstall spark plug wires or connectors securely.

3. Check and Replace Ignition Coils

• Access the ignition coils above the spark plugs.
• Disconnect the ignition coil connectors.
• Remove the ignition coils using a socket wrench.
• Inspect for cracks or corrosion; replace if damaged.
• Install new ignition coils, ensuring they are seated correctly, and reconnect the wiring.

4. Inspect Fuel Injectors

• Disconnect the fuel injector connectors and remove the fuel rail if necessary.
• Check for clogs or leaks in the injectors; clean using a fuel injector cleaning kit if needed.
• If injectors are faulty, replace them with OEM parts and reinstall the rail.

5. Clean the Throttle Body and MAF Sensor

• Remove the intake duct leading to the throttle body.
• Use throttle body cleaner to clean the throttle body.
• Detach the MAF sensor and clean it with MAF sensor cleaner (avoid touching the sensing element).
• Reassemble the intake duct and ensure all connections are secure.