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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Raise the vehicle if needed and secure it with jack stands.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, socket set
• Inspect all vacuum hoses and connections for cracks or damage.
• Use a vacuum gauge to test for leaks; replace any damaged hoses.
• Tighten or replace any loose clamps on the intake system.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "ON" position (do not start) and check the pressure reading.
• If the pressure is below manufacturer specifications, inspect the fuel pump and filter, replacing as necessary.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth
• Disconnect the MAF sensor wiring harness.
• Remove the MAF sensor from the intake duct.
• Spray MAF cleaner on the sensor element and allow it to dry completely before reinstallation.

5. Inspect and Test Fuel Injectors

• Tools Required: Multimeter, fuel injector cleaning kit
• Disconnect fuel injector connectors and perform a resistance test using a multimeter; check against manufacturer specifications.
• If any injectors are out of spec, replace them. If they are functioning, consider cleaning them using a fuel injector cleaning kit.

6. Verify Air Filter Condition

• Tools Required: None (if accessible)
• Remove the air filter and visually inspect it for dirt and damage.
• If the filter is clogged, replace it with a new one.