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 with the parking brake engaged.
• Disconnect the vehicle’s 12V battery to ensure safety while working.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, screwdrivers.
• Sub-steps:
  1. Remove the engine cover (if equipped) by unscrewing or unclipping it.
  2. Disconnect the ignition coil connectors from the ignition coils.
  3. Remove the ignition coils by unscrewing them and pulling them out of the spark plug wells.
  4. Inspect the spark plugs for wear. If they are worn or fouled, replace them with OEM or equivalent spark plugs.
  5. Install new ignition coils or re-install existing ones if they are in good condition, ensuring they are seated properly.
  6. Reconnect the ignition coil connectors and replace the engine cover.

3. Check and Clean Fuel System

• Tools Required: Fuel pressure gauge, injector cleaning kit.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail to check for proper fuel pressure as specified by Tesla.
  2. If fuel pressure is low, check the fuel pump and fuel filter for issues. Replace if necessary.
  3. If the injectors are suspected to be clogged, use an injector cleaning kit to clean them or replace them if needed.

4. Inspect Air Intake and Vacuum Lines

• Tools Required: Screwdrivers, vacuum gauge.
• Sub-steps:
  1. Visually inspect the intake manifold and hoses for any signs of cracks, breaks, or disconnections.
  2. Use a vacuum gauge to check for proper vacuum levels and identify any leaks.
  3. Replace or repair any damaged hoses or intake components.

5. Perform Compression Test

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the spark plugs again for easier access.
  2. Insert the compression tester into each cylinder’s spark plug hole.
  3. Crank the engine a few times and record the pressure readings for each cylinder.
  4. Compare the readings to the manufacturer specifications; if any cylinder is significantly lower, further investigation is needed.