how to fix the P0301 code for cylinder 1 misfire 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 required for the repair.
• Disconnect the vehicle’s high-voltage battery for safety.
• Allow the engine to cool before beginning work.

2. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Locate the ignition coil for cylinder 1 (refer to the service manual for exact location).
  2. Disconnect the electrical connector from the ignition coil.
  3. Remove the mounting bolts (if applicable) and pull the ignition coil out.
  4. Install the new ignition coil in place of the old one and secure it.
  5. Reconnect the electrical connector.

3. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil (follow the steps from the previous section).
  2. Use a spark plug socket to unscrew and remove the old spark plug.
  3. Inspect the old spark plug for wear or fouling.
  4. Install the new spark plug, ensuring it is gapped to manufacturer specifications.
  5. Torque the spark plug to the recommended specification.
  6. Reinstall the ignition coil.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Perform a resistance check with a multimeter to ensure the injector is within specifications.
  3. If necessary, clean the fuel injector using a specialized cleaner or replace it with a new injector.
  4. Reconnect the fuel injector connector.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the high-voltage battery.
  2. Use the OBD-II scanner to clear the P0301 code from the vehicle's computer.
  3. Start the vehicle and observe for any check engine lights or abnormalities.