how to fix P0171 code in 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.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner around the intake and hoses to detect leaks.
  3. Replace any damaged hoses or gaskets.

3. Check and Clean the Mass Air Flow (MAF) Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Disconnect the MAF sensor wiring harness.
  2. Remove the MAF sensor from the air intake duct.
  3. Spray MAF sensor cleaner onto the sensing element and allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the wiring harness.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge and turn the ignition on (do not start the engine).
  3. Check the fuel pressure reading; it should match manufacturer specifications (usually around 40-50 psi).
  4. If the pressure is low, inspect the fuel pump, fuel filter, and fuel lines for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaner or removal kit
• Sub-steps:
  1. If necessary, remove the fuel rail and injectors from the engine.
  2. Clean the injectors with a specialized cleaner or replace them if they are clogged.
  3. Reinstall the fuel rail and ensure proper sealing.

6. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and perform a test drive to verify that the issue is resolved.