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

Solution

1. Preparation

• Tools Required: OBD-II scanner, spark plug socket, multimeter, compression tester, vacuum gauge, basic hand tools (sockets, wrenches).
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the engine cover if necessary to access the spark plugs.
  • Use a spark plug socket to remove the spark plug in cylinder 1.
  • Inspect the spark plug for signs of wear, carbon buildup, or damage.
  • If necessary, replace the spark plug with a new one that meets OEM specifications (check vehicle manual for the correct part number).
  • Torque the new spark plug to the manufacturer’s specifications (usually around 15-20 lb-ft).

3. Test and Replace Ignition Coil

• Sub-steps:
  • Disconnect the ignition coil connector on cylinder 1.
  • Use a multimeter to test the resistance of the ignition coil (should typically be between 0.5 and 2.0 ohms; refer to the manual for specific values).
  • If the coil is faulty, replace it with a new OEM ignition coil.
  • Reconnect the ignition coil connector and ensure it is seated properly.

4. Inspect and Clean Fuel Injector

• Sub-steps:
  • Remove the fuel rail to access the fuel injector for cylinder 1.
  • Disconnect the fuel injector connector.
  • Use a fuel injector cleaner to clean the injector, or replace it if necessary (ensure it meets OEM specifications).
  • Reinstall the fuel rail and reconnect the injector connector.

5. Check for Vacuum Leaks

• Sub-steps:
  • Use a vacuum gauge to test for leaks in the intake manifold area.
  • Visually inspect all hoses and connections for cracks or disconnections.
  • Replace any damaged hoses or seals as necessary.

6. Perform a Compression Test

• Sub-steps:
  • Remove the spark plug from cylinder 1.
  • Insert a compression tester into the spark plug hole.
  • Crank the engine a few times and record the compression reading.
  • Compare the reading to the specified compression range in the vehicle manual.
  • If the compression is low, further mechanical inspection may be required.