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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before working on any components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the engine cover if applicable.
  • Visually inspect the air intake ducts, hoses, and gaskets for any cracks or loose connections.
  • Replace any damaged components or tighten connections as necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake system.
  • Disconnect the electrical connector.
  • Remove the MAF sensor from the housing.
  • Clean the sensor using MAF cleaner spray, avoiding contact with other components.
  • If the sensor is damaged, replace it with a new one.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Attach the fuel pressure gauge to the fuel rail.
  • Start the engine and observe the pressure reading.
  • If the pressure is below specifications, inspect the fuel pump and filter, replacing them if necessary.

5. Replace Oxygen Sensors (if needed)

• Sub-steps:
  • Identify the upstream oxygen sensor.
  • Disconnect the electrical connector and unscrew the sensor using an O2 sensor socket.
  • Install the new sensor and reconnect the wiring harness.

6. Clear Codes and Test Drive

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0171 code.
  • Take the vehicle for a test drive to ensure the check engine light does not reappear and that the vehicle is operating normally.