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

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, multimeter, basic hand tools, MAF cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect Air Intake System

• Sub-steps:
  • Visually inspect all air intake hoses and connections for cracks or disconnections.
  • Use a vacuum gauge to check for leaks in the intake system.
  • Replace any damaged or leaking components.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Disconnect the MAF sensor electrical connector.
  • Remove the MAF sensor from the air intake.
  • Spray MAF cleaner onto the sensor element and let it dry.
  • Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Sub-steps:
  • Locate the fuel pressure test port on the fuel rail.
  • Connect the fuel pressure gauge to the test port.
  • Turn the ignition to the "ON" position without starting the engine and check the pressure reading against manufacturer specifications (typically 30-50 PSI).
  • If pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the injectors.
  • Visually inspect each injector for signs of clogging or leaking.
  • Clean the injectors using an appropriate injector cleaner or replace if necessary.

6. Check Engine Coolant Temperature Sensor

• Sub-steps:
  • Locate the engine coolant temperature sensor and disconnect the electrical connector.
  • Use a multimeter to measure the resistance of the sensor; compare the readings to the manufacturer's specifications.
  • Replace the sensor if readings are outside of specifications.