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, multimeter, compression tester.
• Disconnect the negative terminal of the battery to ensure safety during repairs.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover if equipped.
  2. Locate the ignition coil for cylinder 1 (typically found on top of the engine).
  3. Disconnect the electrical connector from the ignition coil.
  4. Remove the bolts securing the ignition coil using a socket set.
  5. Pull the ignition coil out of the cylinder head.
  6. Inspect the spark plug; if it shows wear or damage, remove it using a spark plug socket.
  7. Replace the spark plug with a new one, ensuring it’s gapped to the manufacturer’s specifications.
  8. Install the new ignition coil, tightening bolts to the specified torque (check manufacturer specifications).
  9. Reconnect the electrical connector to the ignition coil.

3. Fuel Injector Inspection

• Sub-steps:
  1. If the misfire persists, remove the fuel injector from cylinder 1.
  2. Inspect the fuel injector for clogs or damage.
  3. Clean the injector using an appropriate injector cleaner or replace it if necessary.
  4. Reinstall the fuel injector securely.

4. Compression Test

• Sub-steps:
  1. If misfire continues, perform a compression test on cylinder 1.
  2. Remove the spark plug from cylinder 1 to access the cylinder.
  3. Insert the compression tester into the spark plug hole.
  4. Crank the engine several times to get a reading.
  5. Compare the reading to manufacturer specifications; if low, further investigation into engine internals may be necessary.

5. Reconnect Battery and Test

• Reconnect the negative terminal of the battery.
• Clear the DTCs using the OBD-II scanner.
• Start the engine and allow it to warm up.