Honda Pilot YF3 (2016-2022) P0171 code, what does it mean and how to fix?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid any electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the air filter box and inspect it for obstructions.
  • Check for any cracks or loose clamps in the intake hoses leading to the throttle body.
  • Tighten or replace any loose or damaged components.
• Tools Required: Screwdrivers, pliers, visual inspection tools.

3. Test and Clean MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Use MAF sensor cleaner to clean the sensor element gently.
  • Reinstall the sensor and reconnect the electrical connector.
• Tools Required: MAF sensor cleaner, Torx or socket set.

4. Check Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine and check the fuel pressure reading.
  • If the pressure is below specifications, check the fuel pump and fuel filter for clogs or failures.
• Tools Required: Fuel pressure gauge.

5. Inspect Vacuum Lines and Fuel Injectors

• Sub-steps:
  • Visually inspect all vacuum lines for cracks or disconnections and replace as necessary.
  • If injectors are clogged, use an injector cleaning kit or consider professional cleaning.
• Tools Required: Vacuum line replacement kit, injector cleaning kit.