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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the vehicle battery to prevent any electrical issues during repairs.

2. Spark Plug Inspection

• Tools Required: Socket set, torque wrench
• Remove the engine cover if applicable.
• Use a spark plug socket to carefully remove the spark plug from cylinder 1.
  • Safety Warning: Ensure the engine is cool to avoid burns.
• Inspect the spark plug for signs of wear, carbon deposits, or damage. Replace if necessary.
• Install the new spark plug and torque it to the manufacturer's specification (typically around 13-15 lb-ft).

3. Ignition Coil Replacement

• Tools Required: Socket set
• Remove the ignition coil from cylinder 1 by unscrewing it.
• Inspect the ignition coil for cracks or damage. Replace if necessary.
• Reinstall the ignition coil securely and ensure all connections are tight.

4. Fuel Injector Testing and Replacement

• Tools Required: Fuel pressure gauge, fuel injector removal tool
• Disconnect the fuel injector connector for cylinder 1.
• Remove the fuel injector using the appropriate tool.
• Test the injector's resistance with a multimeter; it should meet manufacturer specifications.
• If faulty, replace with a new injector and reinstall.

5. Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading. Compare to manufacturer specifications.
• If compression is low, further diagnostics of the engine may be needed.

6. Intake Manifold Cleaning

• Tools Required: Throttle body cleaner, soft brush
• Remove the intake manifold as necessary to access the throttle body and intake ports.
• Clean the throttle body and intake manifold using a throttle body cleaner and soft brush to remove carbon deposits.
• Reassemble the intake manifold, ensuring all gaskets are replaced if necessary.