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

Learn how to diagnose and fix P0171 engine 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 needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

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.
  3. Replace any damaged hoses with OEM parts.
• Tools Required: Socket set, screwdrivers, flashlight.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor using MAF cleaner or replace it if damaged.
  4. Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: Torx screwdriver, MAF sensor cleaner.

4. Check Fuel System

• Sub-steps:
  1. Attach the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and record the pressure reading.
  3. If the pressure is below specifications, check the fuel filter and pump for faults.
  4. Replace the fuel filter if clogged and test the fuel pump by listening for operation or testing voltage.
• Tools Required: Fuel pressure gauge, multimeter.

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Check the wiring and connector for damage or corrosion.
  3. Use a multimeter to test the sensor response by measuring voltage output during engine operation.
  4. Replace any faulty oxygen sensors.
• Tools Required: Multimeter, O2 sensor socket.