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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to ensure safety.
• Allow the engine to cool down before proceeding.

2. Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the spark plugs.
  2. Use a socket set to carefully remove the old spark plugs.
  3. Inspect the old spark plugs for wear and fouling; replace them with new ones if necessary.
  4. Torque the new spark plugs to the manufacturer’s specification (typically around 18-22 lb-ft).
  5. Reinstall the engine cover.

3. Inspect and Replace Ignition Coils

• Sub-steps:
  1. Disconnect the electrical connectors from the ignition coils.
  2. Remove the ignition coils using a socket set.
  3. Inspect the ignition coils for cracks or signs of failure.
  4. Replace any faulty ignition coils with new ones, ensuring they are properly seated.
  5. Reconnect the electrical connectors securely.

4. Fuel System Check

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail to check the pressure against manufacturer specifications.
  2. If pressure is low, inspect the fuel pump and filter for issues and replace as necessary.
  3. Clean or replace fuel injectors if clogged.
  4. Reassemble any components removed during the inspection.

5. Clean MAF and Throttle Body

• Sub-steps:
  1. Remove the air intake duct to access the MAF sensor and throttle body.
  2. Use MAF cleaner to spray the sensor and gently clean it.
  3. Use throttle body cleaner to clean the inside of the throttle body.
  4. Reassemble the air intake duct securely.