how to fix P0171 code in my Toyota RAV4 XA50 (2019-2024)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or disconnections.
  2. Tighten or replace any loose or damaged hoses.
  3. Check the intake manifold for gasket leaks and replace if necessary.
• Tools Required: Socket set, screwdrivers

3. Test and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor; it is usually found between the air filter and the throttle body.
  2. Remove the MAF sensor connector carefully.
  3. Use MAF sensor cleaner to spray the sensor element; do not touch the sensor with tools or fingers.
  4. Reconnect the MAF sensor and clear the P0171 code using a scanner.
• Tools Required: MAF sensor cleaner, Torx or socket set

4. Inspect Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) and check the fuel pressure against manufacturer specifications.
  3. If pressure is low, check the fuel pump and fuel filter for issues. Replace as necessary.
• Tools Required: Fuel pressure gauge, socket set

5. Check and Clean Fuel Injectors

• Sub-steps:
  1. If the fuel pressure is adequate, remove the fuel injectors from the rail.
  2. Inspect for clogs or leaks; consider using a fuel injector cleaning kit if necessary.
  3. Reinstall the injectors ensuring proper sealing and torque specifications.
• Tools Required: Fuel injector cleaning kit, torque wrench