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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the ignition is turned off.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil cover if applicable.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil using the socket set.
• Inspect the spark plug for wear; if it appears damaged or worn, replace it.
  • Sub-step: Use a torque wrench to install the new spark plug to the manufacturer’s specified torque (typically around 18-25 ft-lbs).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Fuel Injector

• Tools Required: Fuel line disconnect tool, O-ring lubricant.
• Disconnect the fuel line from the injector.
• Remove the fuel injector from cylinder 1.
• Inspect the injector for clogs and clean or replace it if necessary.
  • Sub-step: Apply O-ring lubricant to the new injector’s O-rings before installation.
• Reinstall the injector and reconnect the fuel line securely.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the cylinder.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; a significantly low reading may indicate internal engine issues.

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0301 code.
• Start the engine and monitor for any reoccurrence of the misfire code.