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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's 12V battery to ensure safety during repairs.
• Allow the engine to cool completely.

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Unplug the electrical connector from the spark plug of cylinder 1.
3. Using a spark plug socket, remove the old spark plug.
4. Inspect the spark plug for signs of wear, such as carbon buildup or damage.
5. Install a new spark plug (OEM recommended type) and torque to the manufacturer’s specifications (typically around 18 ft-lbs).
6. Reconnect the electrical connector and replace the engine cover.

3. Inspect and Replace Ignition Coil

1. Remove the electrical connector from the ignition coil for cylinder 1.
2. Unscrew the ignition coil using a socket set and lift it out.
3. Inspect the ignition coil for physical damage or signs of arcing.
4. Install a new ignition coil (OEM recommended) and torque to the manufacturer’s specifications (typically around 10-12 ft-lbs).
5. Reconnect the electrical connector.

4. Check and Replace Fuel Injector

1. Disconnect the fuel supply line to cylinder 1, using caution to avoid fuel spillage.
2. Remove the retaining clips and pull out the fuel injector from its rail.
3. Inspect the injector for clogs or damage.
4. Install a new fuel injector (OEM recommended) and ensure it is seated correctly.
5. Reattach the fuel line securely.

5. Clear Codes and Test Drive

1. Reconnect the vehicle's 12V battery.
2. Use an OBD-II scanner to clear the P0301 code.
3. Test drive the vehicle to ensure no further misfire codes appear and that performance has returned to normal.