how to resolve P0171 lean condition code in Tesla Model S Original (2012-2020)

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative terminal of the battery.

2. Inspect and Replace Air Intake Components

• Inspect Air Intake Hoses
  • Check all rubber hoses for cracks or wear.
  • Replace any damaged hoses with OEM parts.
• Check the Air Filter
  • Remove the air filter housing.
  • Inspect the air filter; replace if dirty or clogged.

3. Clean or Replace the MAF Sensor

• Remove MAF Sensor
  • Disconnect the electrical connector from the MAF sensor.
  • Unscrew the MAF sensor from the air intake assembly.
• Clean MAF Sensor
  • Use MAF sensor cleaner to spray the sensor elements.
  • Allow it to dry completely before reinstalling.
• Reinstall MAF Sensor
  • Secure the MAF sensor back into position and reconnect the electrical connector.

4. Check Fuel Pressure

• Connect Fuel Pressure Gauge
  • Locate the fuel rail and attach a fuel pressure gauge.
• Test Fuel Pressure
  • Turn the ignition to the "ON" position (do not start) and observe the pressure reading. Compare it to the manufacturer’s specifications.
• Replace Fuel Pump (if necessary)
  • If pressure is low, remove the fuel pump assembly and replace it with a new OEM fuel pump.

5. Inspect and Clean Fuel Injectors

• Remove Fuel Injectors
  • Disconnect fuel lines and electrical connectors from the injectors.
  • Remove the fuel rail with injectors attached.
• Clean or Replace Injectors
  • Use an injector cleaning kit to clean the injectors.
  • Replace any injectors that are faulty or clogged.

6. Reconnect and Reset

• Reconnect the battery terminal.
• Clear the error codes using the OBD-II scanner.
• Start the vehicle and check for any new codes.