how to fix P0171 code on Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Sub-steps:
  1. Remove the engine cover (if applicable) to access the air intake.
  2. Check all intake hoses and clamps for cracks or loose connections.
  3. Tighten or replace any loose or damaged hoses.
  4. Inspect the air filter; replace if dirty or clogged.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from the housing.
  4. Spray the MAF sensor with the cleaner and allow it to dry completely before reinstalling.

4. Test and Replace Fuel Pump (if necessary)

• Tools Required: Fuel pressure gauge, socket set
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check the fuel pressure reading.
  3. If pressure is below specifications, replace the fuel pump.
  4. To replace, relieve fuel system pressure, disconnect the battery, and remove the fuel pump from the fuel tank.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit
• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Clean the injectors using a fuel injector cleaning kit.
  3. Reinstall the injectors and fuel rail ensuring all connections are secure.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code from the system.