my Tesla Model 3 Highland (2024-present) has a check engine light and P0171 code, how to fix?

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, MAF cleaner, torque wrench, fuel pressure gauge.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a vacuum gauge to check for proper readings; a low reading indicates a leak.
  3. Replace any damaged hoses or gaskets found during the inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the intake system.
  2. Disconnect the electrical connector and remove the MAF sensor.
  3. Clean the sensor using MAF cleaner; avoid touching the sensor element.
  4. If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Test and Repair Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check fuel pressure against manufacturer specifications.
  3. If the pressure is low, inspect and replace the fuel pump if necessary.
  4. Remove and clean the fuel injectors using a fuel injector cleaning kit or replace them if clogged.

5. Verify Air Filter Condition

• Sub-steps:
  1. Remove the engine air filter from the air box.
  2. Check for dirt and debris; replace if necessary.
  3. Ensure the air filter is seated properly to avoid unmetered air entering the engine.