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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, dielectric grease.
• Sub-steps:
  1. Locate the ignition coil on cylinder 1 (refer to the service manual for exact location).
  2. Remove the ignition coil by unscrewing the mounting bolts and disconnecting the electrical connector.
  3. Inspect the spark plug for wear or damage; replace it if necessary.
     • Torque specification: 18 lb-ft for spark plug installation.
  4. Apply dielectric grease to the ignition coil connector and reinstall the coil.
  5. Secure the coil in place with the mounting bolts.

3. Inspect Fuel Injector

• Tools Required: Fuel injector removal tool, torque wrench.
• Sub-steps:
  1. Disconnect the fuel line and electrical connector from the fuel injector for cylinder 1.
  2. Remove the fuel injector using the appropriate tool.
  3. Check the injector for clogs or damage; replace if necessary.
  4. Reinstall the fuel injector ensuring it is seated correctly.
  5. Reconnect the fuel line and electrical connector.

4. Check for Vacuum Leaks

• Tools Required: Smoke machine (if available) or carburetor cleaner.
• Sub-steps:
  1. Inspect all vacuum hoses connected to the intake system for cracks or disconnections.
  2. Use a smoke machine to detect leaks around the intake manifold.
  3. If leaks are found, replace damaged hoses or reseal the intake manifold as necessary.

5. Conduct Compression Test (if needed)

• Tools Required: Compression gauge.
• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine several times and record the pressure reading.
  4. Compare the reading to manufacturer specifications; if low, further engine repairs may be required.