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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, flashlight, hose clamps.
• Use a vacuum gauge to check for leaks in the intake system.
• Inspect all hoses and connections visually and with your hands for any signs of wear or disconnection.
• Replace any damaged or cracked hoses and ensure that all connections are secured tightly.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver.
• Remove the MAF sensor from the air intake duct.
• Spray MAF cleaner onto the sensor elements to remove dirt and debris—do not touch the sensor with your hands or any tools.
• Reinstall the MAF sensor and ensure it is secured properly.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Connect the fuel pressure gauge to the fuel rail and turn the ignition on without starting the engine. Check the fuel pressure against manufacturer specifications.
• If pressure is low, inspect the fuel pump and replace the fuel filter if necessary.
• If fuel injectors are suspected to be clogged, use a fuel injector cleaning kit or replace the injectors as needed.

5. Inspect Throttle Body

• Tools Required: Throttle body cleaner, socket set.
• Remove the throttle body from the intake manifold.
• Clean the throttle body using throttle body cleaner to remove any carbon buildup.
• Reinstall the throttle body and ensure all bolts are tightened to the manufacturer's specifications.