how to fix P0171 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 securely raise it if necessary.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum lines and gaskets connected to the intake manifold.
  2. Use a smoke machine or aerosol carb cleaner to identify leaks—apply around suspected areas and watch for changes in engine RPM.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean the Mass Air Flow Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor; it is typically found between the air filter and the throttle body.
  2. Disconnect the electrical connector and remove the sensor from the intake.
  3. Use MAF sensor cleaner to spray the sensor elements and allow it to dry completely before reinstallation.

4. Test and Repair Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition key to the “ON” position (do not start) to check the pressure reading.
  3. Compare the reading with manufacturer specifications; if low, inspect the fuel pump and filter for issues.
  4. Replace the fuel pump or filter if required.

5. Inspect and Test Fuel Injectors

• Tools Required: Multimeter, injector cleaning kit
• Sub-steps:
  1. Test each fuel injector's resistance using a multimeter; ensure values are within specifications.
  2. If an injector is faulty, remove it and use an injector cleaning kit to clean or replace it.
  3. Reinstall injectors ensuring proper sealing.

6. Check Oxygen Sensors

• Sub-steps:
  1. Inspect the wiring and connectors of the upstream oxygen sensor for damage.
  2. Use a multimeter to check sensor function according to manufacturer specifications.
  3. Replace the oxygen sensor if faulty.