how to fix P0301 misfire code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Remove Ignition Coil and Spark Plug

• Tools Required: Socket set, ratchet, spark plug socket.
• Remove any engine cover or components obstructing access to cylinder 1.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil mounting screws and carefully pull the coil out.
• Use a spark plug socket to remove the spark plug from cylinder 1.

3. Inspect and Replace Components

• Inspect the spark plug for signs of wear, carbon buildup, or damage. Replace if necessary.
• Check the ignition coil for cracks or burn marks. Replace if damaged.
• Verify the fuel injector is functioning correctly; replace if it shows signs of malfunction.

4. Reassemble Components

• Install the new or inspected spark plug, tightening it to the manufacturer’s specified torque (typically around 15-20 lb-ft).
• Reinstall the ignition coil, securing it with the mounting screws and reconnecting the electrical connector.
• Replace any engine cover or components that were removed during access.

5. Clear Codes and Test Drive

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0301 code.
• Start the vehicle and allow it to idle; observe for any persistent check engine lights.
• Conduct a test drive to ensure the vehicle operates smoothly without any misfire occurrences.