how to resolve P0171 lean condition code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all air intake hoses and connections for cracks or loose fittings.
  • Replace any damaged hoses or secure loose connections.
  • Tighten the intake manifold bolts to the manufacturer's torque specifications.

3. Clean or Replace Mass Airflow Sensor (MAF)

• Sub-steps:
  • Remove the MAF sensor from the intake duct.
  • Clean the MAF sensor using MAF cleaner spray and allow it to dry.
  • If the sensor is faulty, replace it with a new one and reinstall.

4. Check and Adjust Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start) and check the fuel pressure. It should match the manufacturer's specifications.
  • If the pressure is low, inspect the fuel pump and fuel filter for issues, replacing them as necessary.

5. Inspect and Clean Throttle Body

• Sub-steps:
  • Remove the air intake duct to access the throttle body.
  • Clean the throttle body using throttle body cleaner and a soft cloth.
  • Ensure the throttle plate opens and closes freely.

6. Test Fuel Injectors

• Sub-steps:
  • Use a multimeter to test the resistance of each fuel injector.
  • If any injector shows abnormal resistance, replace the injector.
  • Consider performing a fuel injector cleaning service if clogging is suspected.