how to troubleshoot my Tesla Model 3 Original (2017-2023) with a P0301 misfire code

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate and remove the spark plug for cylinder 1 using a spark plug socket.
  3. Inspect the spark plug for signs of fouling, wear, or damage. Replace if necessary.
  4. Install a new spark plug, ensuring it is gapped correctly (consult specifications for gap size).
  5. Torque the spark plug to the manufacturer’s specifications.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the electrical connector from the ignition coil for cylinder 1.
  2. Remove the ignition coil from its mounting position.
  3. Inspect the ignition coil for signs of damage or wear. Replace if necessary.
  4. Install the new ignition coil and reconnect the electrical connector.

4. Fuel Injector Inspection

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Remove the fuel injector from the rail.
  3. Inspect the injector for clogs or leaks. Clean or replace if necessary.
  4. Reinstall the fuel injector and reconnect the electrical connector.

5. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1 once more.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine a few times to get a reading on the gauge.
  4. Compare the reading with manufacturer specifications. If low, further investigation is needed.

Tools Required:

• OBD-II scanner
• Spark plug socket
• Torque wrench
• Compression gauge
• Basic hand tools (sockets, wrenches, screwdrivers)

Parts Required:

• Spark plug (if faulty)
• Ignition coil (if faulty)
• Fuel injector (if clogged or defective)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical components.
• Allow the engine to cool down before inspecting or removing parts.