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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical issues.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, ignition coil puller, dielectric grease.
• Remove the engine cover (if applicable) using the socket set.
• Disconnect the electrical connectors from each ignition coil.
• Remove the ignition coils using the socket set; inspect for cracks or carbon buildup.
• Replace any faulty ignition coils with new ones.
• Remove and inspect spark plugs; replace if worn or fouled. Use the appropriate spark plug gap specifications.
• Apply dielectric grease to the new ignition coils' connectors for better conductivity.

3. Check Fuel Delivery

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "on" position (without starting the engine) to check the pressure.
• If pressure is below specification, check the fuel pump and filter for blockages or wear.

4. Inspect Intake and Vacuum System

• Tools Required: Screwdriver set, vacuum gauge.
• Inspect all intake hoses and connections for leaks; replace any damaged hoses.
• Use a vacuum gauge to check for normal readings; abnormal readings may indicate a vacuum leak.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plugs and insert the compression tester into the cylinder head.
• Crank the engine several times and record the compression readings for each cylinder.
• Compare the results against manufacturer specifications. Replace any components as necessary if low compression is detected.