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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool before beginning work.
• Disconnect the negative terminal of the battery.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil cover (if applicable) and disconnect the electrical connector from the ignition coil.
• Unscrew the ignition coil and remove it from the spark plug.
• Use a spark plug socket to remove the old spark plug from cylinder 1.
• Inspect the spark plug for signs of wear (e.g., carbon buildup, damage).
• Install a new spark plug, ensuring it is gapped correctly per manufacturer specifications (usually around 0.030-0.040 inches).
• Torque the spark plug to the manufacturer's specified value (typically around 15-20 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

• If the spark plug was not the issue, test the ignition coil using a multimeter.
• Tools Required: Multimeter.
• Disconnect the ignition coil from the electrical connector and measure the resistance across the primary and secondary terminals.
• Compare the readings with the specifications in the vehicle service manual. If out of range, replace the ignition coil.

4. Clean or Replace Fuel Injector

• If misfire persists, inspect the fuel injector for cylinder 1.
• Tools Required: Fuel injector removal tool (if necessary).
• Disconnect the fuel injector electrical connector and fuel line (ensure to relieve fuel pressure before this step).
• Remove the fuel injector and inspect for clogs or damage.
• Clean the injector using a specialized cleaning kit or replace it if necessary.