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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle’s 12V battery to ensure safety while working on electrical components.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Remove the engine cover using a socket set.
  2. Disconnect the ignition coil wiring harness from the ignition coil in cylinder 1.
  3. Remove the ignition coil from the cylinder head.
  4. Replace the ignition coil with a new one. Torque to manufacturer's specifications (usually around 7-10 Nm).
  5. Repeat for the spark plug: remove the spark plug using a spark plug socket, inspect for wear, and replace if necessary. Torque new spark plug to 25 Nm.

3. Fuel Injector Inspection

• Sub-steps:
  1. Disconnect the fuel injector connector from the injector for cylinder 1.
  2. Remove the fuel rail if necessary to access the injector.
  3. Check the injector for clogs or damage; replace if faulty.
  4. Reinstall the fuel rail and ensure all connections are secure.

4. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert a compression gauge into the spark plug hole and crank the engine.
  3. Record the compression reading and compare it to specifications (typically 180-200 psi).
  4. If compression is low, further investigate potential issues like valve seating or head gasket failure.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum lines connected to the intake manifold.
  2. Use a smoke tester to identify any leaks in the intake manifold or vacuum lines.
  3. Repair or replace any damaged hoses or gaskets.