how to resolve P0300 misfire code in Tesla Model 3 Original (2017-2023)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the high-voltage battery before starting any work.
• Allow the vehicle to cool down to avoid burns.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover to access the spark plugs.
  2. Use a spark plug socket to remove the spark plugs.
  3. Inspect the spark plugs for wear, carbon buildup, or damage.
  4. Replace any faulty spark plugs with OEM specifications.
  5. Torque the new spark plugs to the manufacturer’s specified value (typically around 20 Nm).

3. Check and Replace Ignition Coils

• Sub-steps:
  1. Remove the ignition coil connectors.
  2. Unbolt the ignition coils using a socket set.
  3. Inspect each ignition coil for cracks or signs of failure.
  4. Replace any faulty ignition coils with new ones.
  5. Reconnect the ignition coil connectors securely.

4. Inspect Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the vehicle to check for fuel pressure.
  3. Ensure that the pressure meets the manufacturer’s specifications (usually around 50-60 psi).
  4. If pressure is low, check the fuel pump and fuel filter, replacing as necessary.

5. Clear Codes and Test Drive

• Sub-steps:
  1. Use the OBD-II scanner to clear the P0300 code.
  2. Take the vehicle for a test drive under various conditions to ensure the misfire has been resolved.
  3. Re-scan the vehicle for any error codes after the test drive.

Tools Required:

• OBD-II scanner
• Spark plug socket
• Torque wrench
• Fuel pressure gauge
• Socket set

Parts Required:

• Spark plugs
• Ignition coils (if faulty)
• Fuel filter (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the high-voltage battery before working on ignition components to prevent electric shock.
• Allow the engine to cool before starting the inspection and repair process to avoid burns.