why is my Tesla Model 3 Original (2017-2023) showing a P0300 misfire code

Solution

1. Preparation

• Gather tools and safety equipment.
• Disconnect the negative terminal of the 12V battery to ensure safety while working on electrical components.

2. Inspect and Replace Ignition Components

• Inspect Spark Plugs
  • Remove the spark plugs using a socket wrench.
  • Check for wear, fouling, or damage. Replace with OEM specifications if damaged.
• Replace Ignition Coils
  • Disconnect the electrical connectors from the ignition coils.
  • Remove the ignition coils using a socket wrench and replace them with new ones if faulty.

3. Check and Clean Fuel Injectors

• Inspect Fuel Injectors
  • Disconnect the fuel injector connectors.
  • Remove the fuel rail if necessary to access the injectors.
  • Clean the injectors with a specialized cleaner or replace them if clogged or damaged.

4. Vacuum Leak Inspection

• Check for Vacuum Leaks
  • Inspect all hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to locate leaks. Replace any faulty hoses.

5. Engine Compression Test

• Perform Compression Test
  • Remove the spark plugs again.
  • Insert the compression tester into each cylinder and crank the engine to obtain readings.
  • Compare the readings across all cylinders; replace the head gasket or other components if readings are inconsistent.