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

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench
• Remove the engine cover (if applicable).
• Locate the ignition coil for cylinder 1, which may be near the front of the engine.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil retaining bolts and lift out the ignition coil.
• Install the new ignition coil and secure it with the retaining bolts to the manufacturer’s specified torque.
• Reconnect the electrical connector.

3. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, anti-seize compound
• Remove the ignition coil as described above.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear; replace it if necessary.
• Apply a small amount of anti-seize compound on the threads of the new spark plug.
• Install the new spark plug and tighten to the manufacturer’s specified torque.

4. Check Fuel Injector

• Tools Required: Fuel injector tool or multimeter
• Ensure the ignition is off and battery is disconnected.
• Locate the fuel injector for cylinder 1 and disconnect the electrical connector.
• Use a multimeter to check for resistance in the injector; it should be within the specified range (consult service manual).
• If defective, replace the fuel injector with a new one.
• Reconnect the electrical connector.

5. Reassemble and Reconnect

• Reinstall any components removed during the repair (e.g., engine cover).
• Reconnect the battery.
• Clear the diagnostic trouble code using the OBD-II scanner.