how to fix Honda Pilot YF4 (2023-Present) P0171 code for lean condition

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, torque wrench, MAF cleaner.
• Ensure the engine is cool and disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all intake hoses and connections for signs of wear or cracks.
  2. Tighten any loose clamps and replace damaged hoses.
  3. Remove the air filter and inspect for any obstructions; replace if necessary.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and unscrew the sensor from the duct.
  3. Spray MAF cleaner onto the sensor elements; allow it to dry completely before reinstallation.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure reading.
  3. Compare the reading to manufacturer specifications; replace the fuel pump if pressure is low.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Remove the fuel injector connector from each injector.
  2. Use a multimeter to check the resistance of each injector; compare with specifications.
  3. Replace any injectors that do not meet specifications.

6. Check Oxygen Sensors

• Sub-steps:
  1. Locate the upstream oxygen sensor and disconnect its electrical connector.
  2. Use a multimeter to check the sensor's voltage output; it should fluctuate between 0.1 to 0.9 volts.
  3. Replace the oxygen sensor if the readings are out of specification.