how to fix P0171 lean code on Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check for any loose connections or cracks in the air intake hoses.
• Tighten any loose clamps or replace damaged hoses.
• Inspect the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, torque wrench
• Remove the MAF sensor from the intake.
• Spray the sensor with MAF cleaner and allow it to dry.
• Reinstall the MAF sensor and secure it to the specified torque.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure against manufacturer specifications (typically around 45-50 psi for this model).
• If the pressure is low, inspect the fuel pump and filter for blockage or failure.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner, basic hand tools
• Remove fuel injectors and inspect for clogs or damage.
• Clean the injectors using a specialized injector cleaning kit.
• Reinstall the injectors and ensure they are seated properly.

6. Inspect Vacuum System

• Tools Required: Vacuum gauge
• Connect the vacuum gauge to a vacuum source on the engine.
• Start the engine and check for vacuum leaks.
• If low vacuum is detected, inspect hoses and gaskets for leaks and repair or replace as necessary.