why does my Tesla Model 3 Original (2017-2023) engine misfire with code P0300

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate the spark plugs and disconnect any electrical connectors.
  3. Use a spark plug socket to remove the old spark plugs.
  4. Inspect the spark plugs for fouling or damage and replace with new spark plugs if needed (ensure correct type and gap).
  5. Reinstall the spark plugs and reconnect the electrical connectors.

3. Inspect and Replace Ignition Coils

• Sub-steps:
  1. Remove the ignition coil connectors from each coil.
  2. Remove the ignition coils using a socket and ratchet.
  3. Inspect for any signs of damage or wear; replace any faulty coils with new ones.
  4. Reinstall the ignition coils and reconnect the electrical connectors.

4. Fuel System Inspection

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start the engine) and check for proper fuel pressure according to manufacturer specifications.
  3. If pressure is low, check the fuel pump and filter for clogs or failures and replace as necessary.

5. Air Intake System Check

• Sub-steps:
  1. Inspect the air filter for clogs and replace if necessary.
  2. Check the intake manifold and hoses for leaks or cracks.
  3. Ensure the throttle body is clean and functioning correctly; clean if needed.