how to fix P0171 code in Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses and connections for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to detect leaks.
  • Repair or replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct using a Torx or Phillips screwdriver.
  • Clean the MAF sensor using MAF sensor cleaner. Do not touch the sensing element.
  • Allow it to dry completely and reinstall it. If cleaning does not resolve the issue, replace the MAF sensor.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure against manufacturer specifications (typically around 40-50 psi).
  • If the pressure is low, check the fuel pump and fuel filter for faults and replace if necessary.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  • Remove the fuel rail assembly to access the injectors.
  • Visually inspect injectors for clogs or leaks.
  • Use a multimeter to check the resistance of each injector; replace any that are out of specification.

6. Check Oxygen Sensors

• Sub-steps:
  • Use a multimeter to test the voltage output of the upstream oxygen sensor. It should fluctuate between 0.1 to 0.9 volts.
  • If readings are not within specifications, replace the oxygen sensor.