why does my Honda CR-V Fifth Generation (2017-2022) throw a P0171 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical issues.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use a smoke machine to identify any hidden leaks in the intake system.
  • Replace any damaged hoses or gaskets found during inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor using MAF cleaner spray; avoid touching the sensor element.
  • Reinstall the MAF sensor and ensure it is securely connected.

4. Test and Repair Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge at the fuel rail and turn the ignition to the "ON" position (without starting the engine) to check pressure.
  • If pressure is below specifications, inspect the fuel pump and filter; replace if necessary.
  • If injectors are clogged, remove and clean them using an ultrasonic cleaner or replace if necessary.

5. Inspect Throttle Body

• Sub-steps:
  • Remove the air intake duct to access the throttle body.
  • Clean the throttle body using throttle body cleaner and a soft cloth, removing any carbon deposits.
  • Reinstall the throttle body and air intake duct securely.