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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the vehicle's 12V battery to avoid electrical shocks.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Locate cylinder 1 spark plug (typically the front-left plug when facing the engine).
  2. Remove the ignition coil by unscrewing the retaining bolt and gently pulling it out.
  3. Remove the spark plug using a socket wrench.
  4. Inspect the spark plug for wear; replace if necessary with a new spark plug that meets OEM specifications.
  5. Reinstall the spark plug and ignition coil, ensuring they are tightened to the manufacturer's torque specifications (usually 15-20 Nm).

3. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Remove the fuel rail if necessary to access the injector.
  3. Carefully pull out the old fuel injector from its seat.
  4. Install the new fuel injector, ensuring proper fit and sealing.
  5. Reconnect the fuel rail and injector connector.

4. Check for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold.
  2. Use a smoke machine or propane torch (with extreme caution) to identify leaks around the intake manifold.
  3. Replace any damaged hoses or gaskets.

5. Compression Test (if necessary)

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine to measure the compression reading. It should meet the manufacturer's specifications (typically around 180-200 psi).
  4. If the compression is low, further investigation is needed for internal engine repairs.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression gauge
• Smoke machine (optional)
• Propane torch (optional, for vacuum leak detection)

Parts Required:

• Spark plugs
• Fuel injector (if needed)
• Vacuum hoses (if damaged)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the 12V battery before performing any electrical work.
• Allow the engine to cool before working on any components to prevent burns.