how to fix P0171 code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical issues.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdrivers, socket set, vacuum gauge
• Check the air filter and replace it if dirty.
• Inspect the air intake hose for damage or leaks. Replace if necessary.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF cleaner
• Remove the MAF sensor from the air intake.
• Spray MAF cleaner on the sensor and let it dry before reinstalling.

4. Check and Repair Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Use a smoke machine to detect any vacuum leaks in the engine. Alternatively, apply carburetor cleaner around suspected areas while the engine is running to see if RPMs change.
• Replace damaged vacuum hoses or components as needed.

5. Inspect Fuel System

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start) and check the fuel pressure.
• If pressure is below specifications, check the fuel pump and filter for faults. Replace if necessary.

6. Test and Replace Fuel Injectors

• Tools Required: Injector cleaning kit or replacement injectors
• If fuel injectors show signs of clogging, clean them using an injector cleaning kit.
• Replace any malfunctioning fuel injectors.