how to fix the P0301 misfire code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner, basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if necessary to access the ignition coil.
2. Disconnect the ignition coil connector on cylinder 1.
3. Remove the ignition coil using a socket set.
4. Inspect the spark plug for wear; if worn or fouled, replace it with a new spark plug according to the manufacturer's specifications.
5. Reinstall the ignition coil and connect its connector.

3. Inspect and Replace Ignition Coil (if necessary)

1. If the ignition coil shows signs of damage or malfunction, remove it.
2. Install a new ignition coil, ensuring it matches the OEM specifications.
3. Torque the ignition coil to manufacturer specifications (typically around 80-100 in-lbs, but refer to the service manual for exact values).

4. Check and Clean Fuel Injector

1. If the injector appears clogged, remove it from the fuel rail (ensure fuel system is depressurized).
2. Use a fuel injector cleaner to flush the injector or replace it if necessary.
3. Reinstall the injector ensuring proper seating and reconnect the fuel rail.

5. Perform Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading. Compare it with manufacturer specifications.
4. If compression is low, further engine diagnostics may be needed.

6. Reconnect Battery and Clear Codes

1. Reconnect the negative battery terminal.
2. Use the OBD-II scanner to clear any trouble codes.
3. Start the engine to verify the repair.