what does it mean when my Tesla Model 3 Highland (2024-present) shows error code P0300

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat, stable surface.
• Disconnect the battery to avoid any electrical issues during the repair.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench
• Remove the engine cover if applicable.
• Using a socket, remove the spark plugs from each cylinder.
• Inspect the spark plugs for signs of wear or damage (e.g., cracks, deposits).
• Install new spark plugs, ensuring to torque them to the manufacturer's specifications (usually around 15-20 ft-lbs).

3. Check and Replace Ignition Coils

• Tools Required: Multimeter, socket set
• Remove the ignition coils from the engine.
• Using a multimeter, test the resistance of each coil according to manufacturer specifications.
• Replace any coils that are out of spec.
• Reinstall the ignition coils securely.

4. Inspect Fuel Injectors

• Tools Required: Fuel pressure gauge, socket set
• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "On" position without starting the engine and check the fuel pressure reading.
• If the pressure is below specifications, inspect and clean or replace the fuel injectors.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or spray bottle with soapy water
• Use a smoke machine to introduce smoke into the intake system; look for smoke escaping, which indicates a leak.
• Alternatively, spray soapy water around intake hoses and connections; bubbling indicates a leak.
• Repair any leaks found.

6. Perform Engine Compression Test

• Tools Required: Compression tester
• Remove spark plugs again to access the cylinders.
• Insert the compression tester into each cylinder and crank the engine.
• Record the compression readings for each cylinder and compare to manufacturer specifications.