how to fix P0301 misfire code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface, and the ignition is turned off.
• Disconnect the vehicle's 12V battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Locate cylinder 1 spark plug (usually the front cylinder on the left side).
• Using a socket set, carefully remove the spark plug.
  • Tools Required: Spark plug socket, ratchet, torque wrench.
• Inspect the spark plug for wear; replace if worn or fouled.
• Install the new spark plug and torque to the manufacturer's specification (usually around 15-20 lb-ft).

3. Inspect and Replace Ignition Coil

• Remove the ignition coil for cylinder 1.
  • Disconnect the electrical connector and unscrew the mounting bolts.
• Inspect the ignition coil for any cracks or damage.
• Replace with a new ignition coil if necessary.
• Reinstall the ignition coil and ensure the connector is secure.

4. Check Fuel Injector

• Inspect the fuel injector for cylinder 1 by removing it from the rail.
  • Disconnect the electrical connector and fuel line (be cautious of fuel spills).
• Test the injector with a noid light to confirm it’s receiving the correct signal.
• Replace the fuel injector if it’s not functioning properly.
• Reinstall the fuel injector and reconnect all lines and connectors.

5. Clear Codes and Reconnect Battery

• Reconnect the 12V battery.
• Use the OBD-II scanner to clear the P0301 code.
• Start the engine and allow it to idle, checking for any returning codes.