how to diagnose 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

• Tools Required: OBD-II scanner, socket set, multimeter, compression tester, torque wrench.
• Disconnect the vehicle's high-voltage battery before starting any work on the ignition system or components.

2. Replace Spark Plug

1. Remove the engine cover (if applicable).
2. Disconnect the ignition coil connector for cylinder 1.
3. Remove the ignition coil by unscrewing it from the cylinder head.
4. Use a spark plug socket to remove the faulty spark plug.
5. Install a new spark plug, ensuring it is gapped correctly (check specifications).
6. Reinstall the ignition coil and reconnect the connector.
7. Replace the engine cover.

3. Replace Ignition Coil (if needed)

1. Follow steps 1-3 from the previous section.
2. Remove the faulty ignition coil and replace it with a new one.
3. Reinstall the ignition coil and reconnect the connector.
4. Replace the engine cover.

4. Clean or Replace Fuel Injector (if needed)

1. Disconnect the fuel injector electrical connector.
2. Remove the fuel rail (if necessary) to access the injector.
3. Clean the injector using a professional cleaning kit or replace it with a new one.
4. Reinstall everything in reverse order, ensuring all connections are secure.

5. Perform Compression Test (if needed)

1. Remove the spark plug for cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine a few times while monitoring the compression reading.
4. If the compression is below specifications, further engine diagnostics will be required.