why does my Tesla Model S Original (2012-2020) keep throwing a P0300 code?

Learn how to diagnose and fix P0300 engine misfire in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and securely raise it with jack stands if necessary.
• Disconnect the battery to prevent electrical shock.

2. Check and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the ignition coil connectors.
• Unbolt and carefully remove the ignition coils.
• Remove old spark plugs using a spark plug socket and inspect for wear (fouling, gap).
• Install new spark plugs to the manufacturer's specified torque (usually around 18 lb-ft).
• Reinstall ignition coils and connect the connectors.

3. Inspect and Replace Ignition Coils (if necessary)

• Tools Required: Socket set
• If any ignition coils are found faulty during inspection, replace them one at a time.
• Unbolt and remove the defective ignition coil.
• Install a new ignition coil and secure it with bolts.
• Reconnect the ignition coil connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Attach the fuel pressure gauge to the fuel rail's test port.
• Turn the ignition to the "ON" position (do not start) and check the pressure against OEM specifications.
• If pressure is low, inspect the fuel pump and filter for functionality.
• Replace any faulty components found during inspection.

5. Inspect Vacuum Lines

• Visually check all vacuum lines for cracks or loose connections.
• Replace any damaged vacuum lines to ensure proper engine operation.