how to diagnose P0301 misfire code in Tesla Model 3 Highland (2024-present)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the ignition coil from cylinder 1 by detaching the electrical connector and unbolting it.
  2. Extract the spark plug using a spark plug socket.
  3. Inspect the spark plug for signs of wear or damage. Clean or replace if necessary.
  4. Install the new or cleaned spark plug and torque it to the manufacturer's specifications (typically around 15-20 lb-ft).
  5. Reattach the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil test indicated a fault, remove the defective coil by loosening the bolts and disconnecting the connector.
  2. Install the new ignition coil and torque the bolts to the manufacturer's specifications.
  3. Reconnect the electrical connector.

4. Fuel Injector Cleaning/Replacement

• Sub-steps:
  1. If the fuel injector is faulty, disconnect the fuel line and electrical connector.
  2. Remove the injector using the appropriate tool and clean it using a suitable injector cleaner or replace it with a new one.
  3. Reinstall the injector, ensuring it is seated properly and reconnect the fuel line and electrical connector.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code.

Tools Required:

• OBD-II scanner
• Socket set
• Multimeter
• Torque wrench
• Fuel line disconnect tool (if needed)
• Spark plug socket

Parts Required:

• Spark plug (if replacement is needed)
• Ignition coil (if replacement is needed)
• Fuel injector (if replacement is needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before performing any maintenance.