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 required for the repair.
• Ensure the vehicle is parked on a level surface and securely lift it using jack stands if needed.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Ignition System

• Sub-steps:
  1. Remove the engine cover if necessary to access ignition components.
  2. Disconnect the electrical connector from the ignition coil on cylinder 1.
  3. Remove the ignition coil using a socket set (typically a 10mm socket).
  4. Inspect the spark plug for wear or fouling; replace it if necessary (torque to manufacturer specifications).
  5. Reinstall the ignition coil and reconnect the electrical connector.

3. Check Fuel Injector

• Sub-steps:
  1. Disconnect the electrical connector from the fuel injector on cylinder 1.
  2. Use a fuel injector test kit to check the injector's pulse and spray pattern.
  3. If faulty, replace the fuel injector (ensure proper seating and torque per specifications).
  4. Reconnect the electrical connector to the fuel injector.

4. Inspect for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all hoses and gaskets around cylinder 1 for cracks or disconnections.
  2. Use a smoke machine or carb cleaner to detect vacuum leaks while the engine is running.
  3. Repair or replace any damaged hoses or gaskets found during inspection.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and read the compression value.
  4. If compression is below specification, further investigation of the cylinder's internals is necessary.