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

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable to gain access to the spark plugs.
  2. Using a spark plug socket and ratchet, carefully remove the spark plugs.
  3. Inspect each spark plug for wear, carbon buildup, or damage.
  4. Replace any faulty spark plugs with OEM-spec replacements. Torque to manufacturer specifications (typically around 20 Nm).

3. Test and Replace Ignition Coils

• Sub-steps:
  1. Disconnect the electrical connectors from each ignition coil.
  2. Remove the ignition coils using a socket set.
  3. Test each coil using a multimeter for proper resistance (consult service manual for specs).
  4. Replace any defective coils with new ones, ensuring proper connection and alignment.

4. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Access the fuel injectors by removing the intake manifold if necessary.
  2. Inspect the injectors for signs of clogging or leaks.
  3. Use a fuel injector cleaning kit as per the manufacturer's instructions to clean the injectors.
  4. Reinstall injectors and ensure they are seated correctly.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections around the intake manifold.
  2. Use a smoke machine or carburetor cleaner to check for leaks while the engine is running.
  3. Replace or repair any damaged hoses found during inspection.