how to fix P0301 misfire code on Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle’s 12V battery to avoid electrical hazards.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector from the spark plug in Cylinder 1.
  3. Unscrew the spark plug using a spark plug socket and ratchet, and inspect it for wear or carbon buildup.
  4. Replace with a new spark plug that meets manufacturer specifications (typically NGK or Bosch).
  5. Torque the new spark plug to the manufacturer’s specified value (usually around 15-20 ft-lbs).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Remove the ignition coil by unscrewing the mounting bolts.
  2. Inspect the old ignition coil for cracks or carbon tracking.
  3. Install the new ignition coil, ensuring it is seated properly.
  4. Reconnect the ignition coil connector.
  5. Torque the ignition coil mounting bolts to manufacturer specifications.

4. Check Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector in Cylinder 1.
  2. Use a multimeter to test the fuel injector's resistance; it should match the specifications in the service manual.
  3. If faulty, replace the fuel injector by unscrewing it from the rail and installing a new one.
  4. Torque the fuel injector to the specified value and reconnect the electrical connector.

5. Reconnect Battery and Clear Codes

• Reconnect the 12V battery terminals.
• Use the OBD-II scanner to clear the P0301 code and any other stored codes to reset the system.