why does my Tesla Model 3 Highland (2024-present) have a check engine light code P0300

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Ignition Components

• Sub-steps:
  • Remove the engine cover if applicable.
  • Remove the ignition coils from each cylinder.
  • Inspect spark plugs for wear; replace them if they are worn or fouled.
  • Reinstall new or inspected ignition coils, ensuring they are seated properly.

3. Check and Replace Fuel System Components

• Sub-steps:
  • Use a fuel pressure gauge to check fuel pressure at the rail; it should meet manufacturer specifications.
  • If pressure is low, inspect the fuel pump, filter, and lines for blockages.
  • Replace the fuel filter if it is clogged and consider replacing the fuel pump if necessary.

4. Inspect Air Intake and Vacuum System

• Sub-steps:
  • Remove the air intake duct and inspect for cracks or loose connections.
  • Check the Mass Air Flow (MAF) sensor for cleanliness; clean it with MAF sensor cleaner if necessary.
  • Use a smoke machine to detect vacuum leaks around gaskets and hoses; seal or replace any leaks found.

5. Final Assembly

• Sub-steps:
  • Reassemble all components in reverse order.
  • Reconnect the negative battery terminal.
  • Start the engine and allow it to run for a few minutes to ensure everything is functioning correctly.