how to fix P0300 code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Allow the vehicle to cool down before starting work.

2. Inspect and Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the engine cover if necessary.
• Use the spark plug socket to carefully remove each spark plug from the engine.
• Inspect the spark plugs for any signs of wear or fouling.
• Replace with OEM or high-quality aftermarket spark plugs, ensuring to torque them to the manufacturer's specifications (typically around 18-20 lb-ft).

3. Check and Replace Ignition Coils

• Tools Required: 10mm socket, ratchet
• Disconnect the electrical connector from each ignition coil.
• Remove the bolt securing the ignition coil with a 10mm socket.
• Pull the ignition coil out of the cylinder head.
• Inspect the coil for damage and replace any that are faulty. Install new coils and secure them with the bolt.

4. Inspect Fuel System

• Tools Required: Fuel pressure gauge, cleaning kit or replacement injectors
• Use a fuel pressure gauge to check the fuel pressure at the rail; it should meet manufacturer specifications.
• If pressure is low, check the fuel filter for clogs and replace if necessary.
• Clean fuel injectors using a cleaning kit or replace them if they are faulty.

5. Vacuum Leak Test

• Tools Required: Smoke machine or carburetor cleaner
• Use a smoke machine to introduce smoke into the intake system while the engine is running.
• Look for smoke escaping from any hoses or gaskets, indicating a vacuum leak.
• Repair or replace any damaged hoses or gaskets found during inspection.

6. Compression Test

• Tools Required: Compression gauge
• Remove the spark plugs and insert the compression gauge into the cylinder.
• Crank the engine to get a reading, and compare it with the manufacturer’s specifications.
• If compression is low, further investigation is needed for potential internal engine issues.