how to resolve the P0171 code in my 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 required tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure with wheel chocks.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum lines and intake manifold gaskets for cracks or disconnections.
  2. Use a smoke machine or propane leak detector to check for leaks while the engine is running.
  3. If leaks are found, replace the damaged hoses or gaskets as needed.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the intake duct.
  2. Disconnect the electrical connector and remove the sensor from the duct.
  3. Clean the sensor with a specialized MAF cleaner and allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure reading.
  3. Compare the reading to the manufacturer specifications; replace the fuel pump or filter if the pressure is below specification.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Inspect each injector for clogs or leaks.
  3. Clean injectors using an ultrasonic cleaner or replace them if necessary.
  4. Reinstall the fuel rail and ensure proper sealing.