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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is on a level surface and securely parked.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Ignition Components

• Inspect Spark Plugs:

  • Remove the ignition coil cover.
  • Use a socket wrench to remove spark plugs.
  • Inspect each spark plug for wear or carbon buildup.
  • Replace spark plugs if they are worn or fouled.

• Inspect Ignition Coils:

  • Check ignition coils for cracks or signs of arcing.
  • Replace any faulty ignition coils with new ones.

3. Fuel System Maintenance

• Check Fuel Pressure:

  • Attach a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start the engine) and check the pressure readings.
  • If pressure is low, inspect the fuel pump and replace if necessary.

• Clean Fuel Injectors:

  • Use a fuel injector cleaning kit to clean the injectors.
  • Follow the manufacturer’s instructions for the cleaning process.

4. Address Vacuum Leaks

• Inspect Vacuum Lines:

  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Replace any damaged hoses.

• Check Intake Manifold:

  • Remove the intake manifold cover.
  • Inspect the gasket for damage and replace if necessary.

5. Compression Test

• Perform Compression Test:
  • Remove spark plugs and connect a compression gauge to each cylinder.
  • Crank the engine and record compression readings.
  • Compare readings to manufacturer specifications; replace any cylinders with low compression.