how to fix P0301 misfire 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

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, fuel injector cleaner.
• Safely park the vehicle on a flat surface, engage the parking brake, and disconnect the negative terminal of the battery.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate the spark plug for cylinder 1.
  3. Use a socket wrench to carefully remove the spark plug.
  4. Inspect the spark plug for wear or carbon buildup. Replace if necessary.
  5. Install the new spark plug, ensuring it is torqued to manufacturer specifications (typically around 20-30 ft-lbs).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the wiring harness from the ignition coil for cylinder 1.
  2. Remove the ignition coil using a socket wrench.
  3. Inspect the coil for damage or corrosion. Replace if necessary.
  4. Install the new ignition coil, securing it with the appropriate torque.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check for proper resistance (typically around 12-16 ohms).
  3. If the injector is faulty, replace it with a new one.
  4. Reconnect the fuel injector connector.

5. Perform Compression Test

• Sub-steps:
  1. Remove the fuel pump fuse to prevent fuel delivery during the test.
  2. Remove the spark plug for cylinder 1.
  3. Insert the compression tester into the spark plug hole.
  4. Crank the engine and note the compression reading. It should be within the manufacturer’s specifications.
  5. If compression is low, further diagnosis may be needed for valve or head gasket issues.

6. Reassemble and Reconnect

• Sub-steps:
  1. Reconnect all components removed during the repair.
  2. Reinstall the engine cover if it was removed.
  3. Reconnect the negative battery terminal.