how do I fix the P0301 misfire code on my 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. Disconnect the negative battery terminal.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector tester.
• Parts Required: New spark plug, new ignition coil, fuel injector (if needed).

2. Replace Spark Plug and Ignition Coil

1. Remove Engine Cover: Use a socket set to remove bolts securing the engine cover and lift it off.
2. Access Cylinder 1: Locate cylinder 1 spark plug and ignition coil.
3. Remove Ignition Coil: Disconnect the ignition coil connector, remove bolts, and gently pull the coil out.
4. Remove Spark Plug: Use a spark plug socket to carefully unscrew the old spark plug from cylinder 1.
5. Install New Spark Plug: Apply a small amount of anti-seize compound, insert the new spark plug, and torque to manufacturer specifications (typically around 13-15 lb-ft).
6. Install New Ignition Coil: Place the new ignition coil in position, secure with bolts, and reconnect the electrical connector.

3. Inspect and Replace Fuel Injector (if necessary)

1. Remove Fuel Rail: If the fuel injector is faulty, remove the fuel rail by unscrewing the securing bolts and disconnecting the fuel line.
2. Replace Fuel Injector: Carefully remove the old injector and install the new one, ensuring it is seated correctly.
3. Reassemble Fuel Rail: Reattach the fuel rail, securing it with bolts and reconnecting the fuel line.

4. Reconnect Battery and Test

1. Reconnect Battery: Reattach the negative battery terminal.
2. Clear Codes: Use the OBD-II scanner to clear the P0301 code.
3. Test Drive: Start the vehicle and take it for a test drive to ensure the misfire is resolved.