how to resolve 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.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover if necessary to access the air intake components.
  2. Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  3. Replace any damaged hoses or tighten loose connections.
  4. Check the air filter; clean or replace it if clogged.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor on the air intake duct.
  2. Disconnect the electrical connector carefully.
  3. Remove the MAF sensor using a Torx screwdriver.
  4. Clean the MAF sensor with MAF cleaner; do not touch the sensor element.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Fuel System Inspection

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check the fuel pressure; it should meet manufacturer specifications (usually around 40-50 psi).
  3. If pressure is low, inspect the fuel pump and fuel filter for issues; replace if necessary.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel injector connectors.
  2. Perform a resistance test on each injector with a multimeter; compare readings to specifications.
  3. If injectors are clogged, clean them using an ultrasonic cleaner or replace as needed.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0171 code.
  3. Start the engine and allow it to reach operating temperature.