why does my Tesla Model 3 Highland (2024-present) keep throwing P0300 misfire code?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil connectors.
• Use a socket set to remove the spark plugs from each cylinder.
• Inspect the spark plugs for fouling or wear; replace with OEM or equivalent spark plugs if necessary.
• Torque the new spark plugs to manufacturer specifications (typically around 15-20 ft-lbs).

3. Inspect and Replace Ignition Coils

• Remove the old ignition coils by unscrewing them with a socket set.
• Inspect for cracks or damage; replace any faulty ignition coils.
• Reinstall new ignition coils, making sure to secure them properly.

4. Check and Repair Fuel System

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "On" position to check fuel pressure; it should meet manufacturer specifications (usually 40-60 psi).
• If pressure is low, inspect the fuel pump and fuel filter; replace them if necessary.

5. Inspect Air Intake System

• Remove the air intake duct and check for any obstructions or leaks.
• Clean the throttle body if carbon buildup is present.
• Ensure the air filter is clean and replace it if necessary.

6. Test for Vacuum Leaks

• Use a smoke machine or carburetor cleaner to check for vacuum leaks around hoses and intake manifold.
• Repair or replace any damaged hoses or gaskets found during inspection.