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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle's battery to prevent electrical shorts while working on the ignition system.
• Ensure the engine is cool before starting work on the spark plugs and ignition system.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, anti-seize lubricant.
• Remove the ignition coil cover to access the spark plug.
• Using a spark plug socket, carefully remove the spark plug from cylinder 1.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Apply a small amount of anti-seize lubricant on the threads of the new spark plug.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically around 15-20 lb-ft).
• Reattach the ignition coil over the spark plug.

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set.
• Remove the ignition coil from cylinder 1 by disconnecting the electrical connector and unbolting it.
• Inspect the ignition coil for cracks or signs of failure. Replace if necessary.
• Install the new ignition coil and secure it in place.
• Reconnect the electrical connector to the ignition coil.

4. Test Fuel Injector

• Tools Required: Fuel pressure gauge, multimeter.
• Disconnect the fuel injector connector from cylinder 1.
• Use a multimeter to check the resistance of the injector. If it’s outside the manufacturer's specifications, replace the injector.
• Reconnect the fuel injector and ensure it is seated properly.

5. Check for Vacuum Leaks

• Inspect all hoses and connections around the intake manifold and throttle body; replace any damaged hoses.
• If vacuum leaks are found, repair or replace the affected components to ensure proper air intake.