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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the vehicle to cool down before starting repairs.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the spark plug wire or ignition coil connector from cylinder 1.
  3. Use a spark plug socket to remove the spark plug from cylinder 1.
  4. Inspect the spark plug for signs of damage, wear, or carbon buildup.
  5. If necessary, replace with a new spark plug (refer to the manufacturer’s specifications for heat range and gap).
  6. Reinstall the spark plug and reconnect the ignition coil or spark plug wire.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. Remove the ignition coil from cylinder 1 by unscrewing the mounting screws.
  2. Inspect the ignition coil for cracks or signs of failure.
  3. If needed, replace the ignition coil with a new one, ensuring it matches OEM specifications.
  4. Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector

• Sub-steps:
  1. Remove the fuel rail (if necessary) to access the fuel injector for cylinder 1.
  2. Inspect the fuel injector for clogs or leaks.
  3. Clean the fuel injector with an appropriate cleaning solution or replace it if faulty.
  4. Reinstall the fuel rail and ensure all connections are secure.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Install a compression gauge into the spark plug hole.
  3. Crank the engine a few times and note the compression reading.
  4. If the compression is below specifications, further investigation into engine internals may be required.