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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the spark plug wires or ignition coils.
  3. Use a spark plug socket and ratchet to remove the spark plugs.
  4. Inspect the spark plugs for wear and proper gap; replace if necessary.
  5. Install new spark plugs and torque to the manufacturer’s specifications (typically around 15-20 lb-ft).

3. Check and Replace Ignition Coils

• Sub-steps:
  1. Remove the ignition coils from the engine.
  2. Inspect for cracks or signs of damage.
  3. Replace any faulty coils with new ones and ensure they are seated properly.

4. Clean or Replace Fuel Injectors

• Sub-steps:
  1. If injectors are clogged, use a fuel injector cleaner or replace them.
  2. Ensure the fuel rail is depressurized before removal.
  3. Reinstall injectors, ensuring they are properly seated and connected.

5. Inspect for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
  2. Replace any damaged hoses.
  3. Use a smoke machine to detect any hidden leaks if necessary.

6. Reconnect Battery and Test

• Sub-steps:
  1. Reconnect the negative terminal of the battery.
  2. Start the engine and allow it to idle for a few minutes.
  3. Clear any error codes and take the car for a test drive to monitor performance.