how to fix P0171 code in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery.
• Ensure the vehicle is on a flat surface and properly supported.

2. Inspect and Replace Vacuum Hoses

• Visually inspect all vacuum hoses and gaskets for cracks or disconnections.
• Replace any damaged hoses with OEM parts.
• Tighten any loose clamps or connections.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor in the air intake duct.
• Remove the MAF sensor using a Torx screwdriver.
• Clean the sensor with MAF cleaner spray; avoid touching the sensor elements.
• If cleaning doesn't resolve the issue, replace the MAF sensor with a new one.

4. Check and Replace Fuel Filter

• Locate the fuel filter and relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel lines from the filter using a fuel line disconnect tool.
• Replace the filter with a new one, ensuring the flow direction is correct.

5. Inspect Engine Coolant Temperature Sensor

• Disconnect the wiring harness from the coolant temperature sensor.
• Use a multimeter to check the resistance of the sensor; compare it with specifications in the service manual.
• Replace the sensor if it is out of range.

6. Check for Exhaust Leaks

• Inspect the exhaust system from the engine to the catalytic converter for any leaks.
• Repair any found leaks using exhaust sealant or replace damaged sections of the exhaust pipe.