how to fix P0301 code on 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 necessary tools and parts.
• Disconnect the vehicle's 12V battery to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Locate the spark plug for cylinder 1.
  3. Use a spark plug socket to remove the old spark plug.
  4. Inspect the old spark plug for signs of wear or damage (e.g., fouling).
  5. Install a new spark plug (use factory-recommended specifications).
  6. Torque the spark plug to the manufacturer’s specifications (usually around 15-20 lb-ft).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Remove the ignition coil for cylinder 1 by unscrewing it from its mounting.
  2. Inspect the coil for cracks or signs of wear.
  3. Install a new ignition coil.
  4. Torque the ignition coil mounting bolts to the manufacturer's specifications.

4. Test and Replace Fuel Injector (if needed)

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check the resistance of the fuel injector (specifications typically around 12-16 ohms).
  3. If the injector is faulty, remove it from the rail.
  4. Install a new fuel injector, ensuring it is seated properly.
  5. Reconnect the fuel injector connector.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the 12V battery.
  2. Use the OBD-II scanner to clear the P0301 code from the system.
  3. Start the engine and verify that the check engine light is off.