how to fix P0171 lean code in Tesla Model 3 Original (2017-2023)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter, cleaning supplies (MAF cleaner, etc.)
• Disconnect the negative battery terminal to prevent electrical shocks.
• Allow the vehicle to cool down if it has been running.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the intake manifold and hoses for cracks or disconnections.
  2. If leaks are found, replace damaged hoses or gaskets.
  3. Use a smoke machine if necessary to identify vacuum leaks.

3. Test and Clean MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the intake duct.
  3. Clean the sensor using MAF cleaner and allow it to dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Start the engine and monitor the fuel pressure; it should meet manufacturer specifications (usually around 50-60 psi for most vehicles).
  3. If the pressure is low, check the fuel pump and filter for issues and replace if necessary.

5. Inspect and Replace Oxygen Sensors (if needed)

• Sub-steps:
  1. Locate the upstream oxygen sensor connected to the exhaust manifold.
  2. Use a socket wrench to remove the sensor.
  3. Install a new oxygen sensor and ensure it is properly torqued according to manufacturer specifications.

6. Check Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail with injectors from the engine.
  2. Inspect each injector for clogs or wear.
  3. Clean or replace any injectors that are malfunctioning.
  4. Reinstall the fuel rail and ensure all connections are secure.