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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the engine cover if necessary.
• Disconnect the ignition coils by unplugging the electrical connectors.
• Remove the ignition coils by unscrewing them from their mounts.
• Remove the old spark plugs using a spark plug socket.
• Inspect the spark plug gaps using a gap gauge and adjust if necessary.
• Install new spark plugs and torque them to the manufacturer’s specifications (typically around 12-15 ft-lbs).
• Reinstall the ignition coils and reconnect the electrical connectors.

3. Replace Ignition Coils (if necessary)

• Tools Required: Socket set.
• If any ignition coils were found to be faulty during inspection, proceed to replace them.
• Remove the damaged ignition coils as previously described.
• Install new ignition coils, ensuring they are securely mounted.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to check fuel pressure readings.
• If pressure is below specifications, inspect the fuel pump and filter for issues.
• Replace any faulty fuel system components as needed.

5. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0300 code.
• Start the engine and take the vehicle for a test drive to ensure the issue has been resolved.