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

Solution

1. Preparation

• Gather tools and replacement parts needed for the repair.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Repair Intake System

• Tools Required: Socket set, vacuum gauge
• Sub-steps:
  1. Remove the engine cover (if equipped) using a socket set.
  2. Visually inspect all intake hoses and connections for signs of wear or leaks.
  3. Use a vacuum gauge to check for leaks in the intake manifold and hoses.
  4. Replace any damaged or cracked hoses and ensure all connections are secure.

3. Clean MAF Sensor

• Tools Required: MAF cleaner spray, soft cloth
• Sub-steps:
  1. Locate the MAF sensor in the air intake tube.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the MAF sensor carefully using the appropriate socket size.
  4. Spray the MAF cleaner onto the sensor elements and let it dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel System Check

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the Schrader valve.
  2. Turn the ignition to the "On" position without starting the engine to check pressure.
  3. Compare the reading to the manufacturer specifications (typically 50-60 psi for Tesla).
  4. If the pressure is below specifications, inspect the fuel pump and filter for issues.

5. Throttle Body Cleaning

• Tools Required: Throttle body cleaner, soft cloth
• Sub-steps:
  1. Disconnect the throttle body electrical connector and vacuum lines.
  2. Remove the throttle body using the appropriate socket size.
  3. Clean the throttle plate and bore with throttle body cleaner and a soft cloth.
  4. Reinstall the throttle body and reconnect all components.