how to fix the P0171 code in my Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0171 engine too lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter, cleaning solvent.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and connections for cracks or disconnections.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. Clean the MAF sensor using a dedicated MAF cleaner. Gently remove it from the vehicle and spray it with the cleaner while avoiding direct contact with the sensor element.
  4. Reinstall the MAF sensor securely.

3. Check and Adjust Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail to measure fuel pressure.
  2. Compare the reading with the manufacturer's specifications; it should typically be between 43-57 psi (varies by model).
  3. If low, check for fuel pump operation or a clogged fuel filter, and replace as needed.
  4. Inspect the fuel injectors by using a multimeter to check their resistance; typical resistance is 12-16 ohms.
  5. Clean or replace any faulty injectors.

4. Oxygen Sensor Inspection

• Sub-steps:
  1. Using a multimeter, test the oxygen sensor voltage output; it should fluctuate between 0.1 to 0.9 volts while the engine is running.
  2. If the readings are steady or outside this range, replace the oxygen sensor.
  3. Clear the P0171 code using the OBD-II scanner.