how to fix P0171 code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather necessary tools and materials.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Sub-steps:
  1. Remove engine cover if necessary to access air intake components.
  2. Inspect the air intake duct for cracks or loose fittings.
  3. Tighten or replace any loose or damaged hoses.
  4. Reattach any disconnected hoses securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, small brush, torque wrench
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from its housing using the socket set.
  3. Clean the sensor with MAF cleaner, following the instructions on the cleaner.
  4. Allow the sensor to dry completely before reinstalling it.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure and Injectors

• Tools Required: Fuel pressure gauge, multimeter
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check fuel pressure.
  3. Compare the reading to the manufacturer's specifications; replace the fuel pump if pressure is low.
  4. If necessary, test fuel injectors using a multimeter to ensure they are functioning correctly.

5. Inspect for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Sub-steps:
  1. Perform a smoke test on the intake system to identify leaks.
  2. Alternatively, spray carburetor cleaner around gaskets and hoses while the engine is running to detect changes in idle speed.
  3. Repair or replace any identified vacuum leaks.

6. Verify Oxygen Sensor Operation

• Tools Required: OBD-II scanner, multimeter
• Sub-steps:
  1. Use the OBD-II scanner to check the live data from the oxygen sensors.
  2. Ensure the pre-cat oxygen sensor is responding correctly to changes in the air-fuel mixture.
  3. Replace the sensor if it shows incorrect readings.