how to fix P0171 lean code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers, silicone gasket maker.
• Visually inspect all vacuum hoses and connections for wear or disconnections.
• Use a vacuum gauge to check for leaks if necessary.
• Replace any damaged hoses and use silicone gasket maker on any faulty gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver.
• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector and remove the sensor using a Torx screwdriver.
• Clean the MAF sensor with MAF sensor cleaner and allow it to dry.
• If the sensor is damaged, replace it with a new OEM part.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (do not start the engine) and check the pressure reading against manufacturer specifications.
• If pressure is low, inspect the fuel filter and fuel pump for issues, replacing as necessary.

5. Clean Throttle Body

• Tools Required: Throttle body cleaner, socket set.
• Remove the air intake duct to access the throttle body.
• Use throttle body cleaner and a soft brush to clean the throttle body and plate.
• Reassemble the intake duct securely.