how to troubleshoot the P0171 code in my Honda CR-V Fifth Generation (2017-2022)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery before starting any electrical work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the air intake hose and visually inspect for cracks or damage.
  • Check the air filter; replace if dirty or clogged.
  • Reinstall the air intake hose securely.
• Tools Required: Screwdriver, replacement air filter (if needed).

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Disconnect the MAF sensor connector and remove it from the intake.
  • Use MAF cleaner to spray the sensor element gently.
  • Allow it to dry completely and reinstall the sensor.
• Tools Required: MAF cleaner, small socket set.

4. Test Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail service port.
  • Turn the ignition key to the "ON" position (do not start) and check the pressure; it should match manufacturer specifications.
  • If pressure is low, inspect the fuel pump and filter for issues.
• Tools Required: Fuel pressure gauge.

5. Inspect Vacuum Hoses

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks, splits, or disconnections.
  • Use a smoke machine or propane torch (carefully) to check for leaks in the intake manifold.
  • Replace any damaged hoses.
• Tools Required: Smoke machine or propane torch, replacement vacuum hoses.