how to fix P0301 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 necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secured with wheel chocks.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 1 (consult service manual for location).
• Remove the ignition coil by unscrewing the mounting bolts and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for fouling or damage; replace if necessary (OEM specifications recommended).
• Install the new spark plug and torque to manufacturer's specifications (typically 15-20 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

• If the spark plug is in good condition, test the ignition coil using an ohmmeter.
• If the coil is defective, remove it as previously detailed and replace it with a new unit.
• Reinstall the ignition coil and ensure it is securely fastened.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if cleaning), replacement injector if necessary.
• Disconnect the fuel injector connector.
• Remove the fuel rail (if applicable) to access the injector.
• Inspect the injector for clogs or leaks; clean or replace as necessary.
• Reinstall the fuel rail and reconnect the injector connector.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 1.
• Insert the compression tester and crank the engine to obtain a reading.
• Compare the reading with manufacturer's specifications; low compression indicates internal engine issues.