how to resolve a P0171 code on my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect and Repair Air Intake

• Tools Required: Screwdriver set, flashlight, vacuum gauge.
• Sub-steps:
  • Visually inspect the air intake hose for cracks or loose connections.
  • Use a vacuum gauge to check for vacuum leaks around the intake manifold.
  • Repair or replace any damaged hoses or gaskets identified.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner (non-residue), Torx driver.
• Sub-steps:
  • Disconnect the MAF sensor connector.
  • Remove the MAF sensor using the Torx driver.
  • Clean the MAF sensor with MAF cleaner and allow it to dry.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  • Locate the fuel rail and remove the Schrader valve cap.
  • Attach the fuel pressure gauge to the Schrader valve.
  • Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
  • If pressure is low, inspect the fuel pump and filter for issues and replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaner.
• Sub-steps:
  • Disconnect the fuel injector connectors.
  • Use a multimeter to check the resistance of each injector (typically 12-16 ohms).
  • If any injector is out of range, replace it.
  • If injectors are clogged, use injector cleaner to restore functionality.