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

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil using the socket and ratchet.
• Take out the old spark plug using the spark plug socket.
• Inspect the spark plug's condition; replace if worn or damaged.
• Install a new spark plug, tightening to the manufacturer’s specified torque (typically around 20-30 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if needed)

• If the ignition coil is found faulty during inspection, replace it.
• Tools Required: Socket set
• Remove the ignition coil as done previously.
• Install the new ignition coil, ensuring it is seated properly.
• Reconnect the ignition coil connector.

4. Test Fuel Injector

• With the ignition key in the ON position (without starting), listen for the fuel injector clicking sound.
• If no sound is heard, check the electrical connection and replace the injector if necessary.
• Tools Required: Multimeter (if testing electrical connections)
• If replacing, remove the fuel rail as per manufacturer instructions, replace the injector, and reinstall the rail.

5. Perform Compression Test (if misfires persist)

• Tools Required: Compression tester
• Remove the spark plug for cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine a few times and record the reading.
• Compare the reading with specifications; if low, further investigation into the engine internals may be needed.