how do I fix the P0171 code on my Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the work area is clean and well-ventilated.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and replacement hoses as needed.
• Sub-steps:
  1. Use a vacuum gauge to check for leaks; a low reading indicates a leak.
  2. Visually inspect all vacuum lines and gaskets around the intake.
  3. Replace any cracked or damaged hoses and re-tighten clamps to ensure a proper seal.

3. Test and Clean the MAF Sensor

• Tools Required: MAF sensor cleaner (or isopropyl alcohol), small brush.
• Sub-steps:
  1. Locate the MAF sensor between the air filter and the throttle body.
  2. Disconnect the sensor's electrical connector and remove the sensor from the housing.
  3. Spray the MAF sensor cleaner onto the sensor elements, avoiding physical contact.
  4. Allow it to dry completely before reinstallation.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge and appropriate adapter.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail's test port.
  2. Turn the ignition to the "On" position without starting the engine to check the fuel pressure.
  3. Compare the reading to the manufacturer's specifications (typically between 50-60 psi for most setups); replace the fuel pump if pressure is low.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaner and a multimeter.
• Sub-steps:
  1. Disconnect the fuel injectors and test them with a multimeter for resistance (should be within manufacturer’s specified range).
  2. Use a fuel injector cleaner to clean the injectors if they are clogged.
  3. Reinstall the injectors ensuring a proper seal.