how to fix P0171 code on 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.
• Disconnect the vehicle's battery to ensure safety.
• Tools Required: OBD-II scanner, multimeter, fuel pressure gauge, socket set, cleaning supplies for MAF sensor.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks, wear, or disconnections.
  2. Replace any faulty vacuum hoses with new ones.
  3. Check the intake manifold gasket for leaks and replace if necessary.
  4. Reconnect all components securely after inspection.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector and remove the MAF sensor.
  3. Use MAF sensor cleaner to gently clean the sensor element.
  4. Allow it to dry completely before reinstalling.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start the engine) and read the pressure.
  3. Compare the reading to the manufacturer specifications; replace the fuel pump if pressure is low.
  4. Disconnect the gauge and reassemble the fuel rail.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Test each injector using a multimeter to check for resistance and proper operation.
  3. Clean any clogged injectors using an ultrasonic cleaner or replace them if damaged.
  4. Reinstall the injectors, ensuring proper sealing and connections.