how to fix P0300 misfire code on my Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, vacuum gauge.
• Allow the vehicle to cool down before beginning work.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the wiring harness from each ignition coil.
  3. Using a socket set, remove the bolts securing the ignition coils.
  4. Carefully pull out each ignition coil and inspect for damage or wear.
  5. If damaged, replace with new ignition coils (ensure OEM specifications).
  6. Remove the spark plugs using a spark plug socket; inspect for wear, carbon buildup, or damage.
  7. Replace spark plugs if they are worn out (follow manufacturer specifications for gap size).
  8. Reinstall new or inspected ignition coils in the reverse order and torque to manufacturer specifications.

3. Check and Repair Fuel System

• Sub-steps:
  1. Use a fuel pressure gauge to check the fuel pressure at the fuel rail.
  2. If pressure is low, inspect the fuel pump and fuel filter for blockages or damage.
  3. Check fuel injectors for proper operation (clean or replace if necessary).
  4. Reconnect all components securely and clear any codes using the OBD-II scanner.

4. Inspect Intake for Leaks

• Sub-steps:
  1. With the engine running, use a vacuum gauge to check for proper readings.
  2. Inspect all hoses and gaskets for signs of wear or leaks.
  3. If any leaks are found, replace the damaged hoses or gaskets.
  4. Reassemble any components removed for inspection.