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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, noid light, multimeter, safety glasses, gloves.
• Ensure the vehicle is parked on a level surface, and the engine is cool before starting repairs.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil using the socket set.
  4. Remove the spark plug with a spark plug socket.
  5. Inspect the spark plug for wear; replace it if damaged or if the gap is out of specification (typically 0.024-0.028 inches).
  6. Install the new spark plug and torque it to the manufacturer’s specifications (usually around 15 lb-ft).
  7. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is fine, inspect the ignition coil for damage.
  2. Replace the ignition coil if it shows signs of cracks or has failed.
  3. Reinstall the ignition coil and reconnect the connector.

4. Test Fuel Injector

• Sub-steps:
  1. Connect the noid light to the fuel injector connector for cylinder 1.
  2. Crank the engine and verify that the noid light flashes, indicating fuel injector operation.
  3. If it does not flash, the injector may be faulty and needs replacement.
  4. Remove the fuel injector and replace it if necessary, ensuring all seals are in good condition.

5. Perform Compression Test (if needed)

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine to get a reading and compare it with manufacturer specifications (typically 150-200 psi).
  4. If compression is low, further diagnostic steps may be needed to check for internal engine problems.