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

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative terminal of the battery to ensure safety during electrical work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and a flashlight.
• Visually inspect all vacuum hoses connected to the intake system for cracks or disconnections.
• Use a vacuum gauge to test the intake manifold vacuum; replace any hoses that are damaged.
• Check the intake manifold gasket for leaks and replace if necessary.

3. Check and Clean the MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver.
• Remove the MAF sensor from the intake duct (usually requires a Torx screwdriver).
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.

4. Test and Replace Fuel System Components

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail and turn the ignition to the ON position (do not start the engine).
• Check the fuel pressure against manufacturer specifications; replace the fuel filter if pressure is below specifications.
• If the pressure is adequate, inspect the fuel injectors for proper operation; clean or replace as needed.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter, socket set.
• Locate and remove the upstream oxygen sensor from the exhaust system.
• Use a multimeter to test the sensor's resistance; replace it if it does not meet specifications.
• Check the wiring and connectors for corrosion or damage; repair or replace as necessary.