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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, torque wrench, fuel pressure gauge.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plugs

1. Locate Spark Plugs: Remove any covers to access the spark plugs.
2. Remove Spark Plugs:
   • Use the appropriate socket and ratchet to unscrew the spark plugs.
   • Inspect each spark plug for wear, carbon buildup, or damage.
3. Install New Spark Plugs:
   • Apply anti-seize compound to the threads of new spark plugs if required.
   • Install the new spark plugs and torque to manufacturer specifications (typically 18-22 ft-lbs).

3. Inspect and Replace Ignition Coils

1. Remove Ignition Coils: Disconnect the electrical connectors and remove the mounting bolts for each ignition coil.
2. Inspect Coils: Check for cracks or carbon tracking on the ignition coils.
3. Install New Ignition Coils:
   • Replace with new ignition coils, ensuring a secure fit and reconnecting the electrical connectors.
   • Torque the mounting bolts to manufacturer specifications.

4. Check Fuel System

1. Fuel Pressure Test:
   • Connect a fuel pressure gauge to the fuel rail.
   • Turn the ignition key to the "ON" position (without starting) to check the fuel pressure.
   • Ensure it meets the specifications (typically around 50-60 psi for electric fuel systems).
2. Replace Fuel Filter (if necessary): If pressure is low, consider replacing the fuel filter.

5. Reconnect Battery

• Reconnect the vehicle’s battery and ensure all connections are tight.