how to fix P0300 misfire code on Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0300 engine misfire in Tesla Model S Plaid/Refresh. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the vehicle to cool down before starting any work.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, replacement spark plugs, ignition coils (if necessary).
• Remove the engine cover (if applicable) by unscrewing the bolts.
• Carefully disconnect the electrical connectors from the ignition coils.
• Remove the ignition coils by unscrewing them from the engine.
• Inspect the spark plugs for wear; replace them if the electrodes are worn or if the gap is out of specification.
• Install new spark plugs and torque to manufacturer specifications (typically around 15-20 Nm).
• Reinstall the ignition coils and reconnect electrical connectors.

3. Fuel Injector Inspection and Cleaning

• Tools Required: Fuel injector cleaner, cleaning kit, safety glasses, gloves.
• Use the fuel injector cleaner kit to clean the injectors according to the manufacturer's instructions.
• If cleaning is ineffective, remove and replace any faulty fuel injectors.

4. Air Intake and Vacuum System Inspection

• Tools Required: Vacuum gauge, inspection mirror.
• Inspect the air intake system for any signs of leaks or obstructions.
• Use a vacuum gauge to check for any vacuum leaks in the intake manifold or associated hoses.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plugs again to access the cylinders.
• Insert the compression tester into each cylinder and crank the engine to record the pressure.
• Compare the readings against manufacturer specifications to identify any mechanical issues.