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

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, multimeter, replacement ignition coil, replacement spark plug, torque wrench.
• Disconnect the high-voltage battery by following Tesla's safety protocols.
• Allow the vehicle to cool down before beginning any work.

2. Replace Ignition Coil

1. Remove the engine cover if applicable.
2. Disconnect the electrical connector from the ignition coil.
3. Unbolt the ignition coil from the cylinder head (torque specifications: typically around 10-12 Nm).
4. Remove the ignition coil from the cylinder 1.
5. Install the new ignition coil by reversing the removal steps.
6. Reconnect the electrical connector securely.

3. Replace Spark Plug

1. Using a spark plug socket, remove the spark plug from cylinder 1.
2. Inspect the old spark plug for signs of wear (e.g., carbon buildup, electrode wear).
3. Set the gap on the new spark plug to manufacturer specifications (usually around 0.8 mm).
4. Install the new spark plug by hand, then torque to the manufacturer's specification (typically 25-30 Nm).
5. Reinstall any components removed during the process.

4. Reconnect Battery and Test

1. Reconnect the high-voltage battery.
2. Clear the DTC using the OBD-II scanner.
3. Start the vehicle and allow it to reach operating temperature while monitoring for any error codes.