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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all hoses and connections for cracks or signs of wear.
  • Replace any damaged hoses or clamps.
  • Tighten loose connections to eliminate air leaks.

3. Address Fuel Supply Issues

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Start the engine and monitor fuel pressure; it should match manufacturer specifications (usually between 50-60 psi).
  • If pressure is low, check the fuel pump and replace if necessary.

4. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor along the air intake duct.
  • Remove the sensor and clean it with MAF sensor cleaner, avoiding physical contact with the sensor element.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the fuel rail.
  • Clean the injectors using a fuel injector cleaning kit or replace them if found faulty.
  • Reinstall the injectors ensuring they are seated properly and reconnect any electrical connectors.

6. Check and Replace Oxygen Sensors (if necessary)

• Sub-steps:
  • Identify the upstream oxygen sensor located before the catalytic converter.
  • Use an oxygen sensor socket to remove the sensor.
  • Install a new oxygen sensor and reconnect the wiring harness.