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

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaning kit.
• Allow the vehicle to cool down.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Use a socket wrench to remove the spark plug from cylinder 1.
  3. Inspect the spark plug for wear or carbon buildup. Replace if necessary.
  4. If replacing, ensure the new spark plug is gapped correctly according to manufacturer specifications.
  5. Reinstall the spark plug and torque to the manufacturer’s specification (typically around 18-25 lb-ft).

3. Check and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the connector from the ignition coil on cylinder 1.
  2. Remove the ignition coil using a socket wrench.
  3. Test the ignition coil with a multimeter for resistance; replace if it is out of spec.
  4. Install the new ignition coil and reconnect the electrical connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to test the injector resistance; replace if it is out of spec.
  3. If cleaning is needed, use a fuel injector cleaning kit to flush out any blockages.
  4. Reconnect the fuel injector and connector.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester and crank the engine.
  3. Record the compression reading; if below the manufacturer's specification, further investigation into engine internals may be necessary.

6. Reassemble and Reset Codes

• Sub-steps:
  1. Reinstall any components removed for access.
  2. Reconnect the battery terminal.
  3. Clear the codes using the OBD-II scanner.
  4. Start the engine and check for any reoccurring codes.