my Honda Pilot Third Generation (2016-present) has a check engine light and P0171 code, what does it...

Solution

1. Preparation

• Gather tools: OBD-II scanner, vacuum gauge, fuel pressure gauge, multimeter, socket set, cleaning supplies.
• Ensure the vehicle is parked on a flat surface, set the parking brake, and disconnect the battery.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to identify leaks.
  • Replace any damaged hoses or connections.

3. Clean MAF Sensor

• Sub-steps:
  • Disconnect the MAF sensor connector.
  • Remove the MAF sensor from the air intake.
  • Use MAF sensor cleaner to spray the sensing element; allow it to dry completely.
  • Reinstall the MAF sensor and reconnect the connector.

4. Test and Replace Fuel System Components

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the ON position (do not start) and check the fuel pressure against specifications (typically around 40-50 psi).
  • If pressure is low, inspect and replace the fuel pump or filter as needed.
  • If injectors are suspected, use a multimeter to check for proper resistance and replace if faulty.

5. Check Engine Coolant Temperature Sensor

• Sub-steps:
  • Disconnect the ECT sensor connector.
  • Use a multimeter to measure resistance and confirm it matches the manufacturer’s specifications for temperature.
  • If the sensor is faulty, replace it and reconnect.