how to fix P0171 code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the vehicle is parked on a flat surface with the engine off and cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks, wear, or disconnections.
  2. If a leak is suspected, use carburetor cleaner or a smoke machine to identify the leak.
  3. Replace any damaged hoses or fittings.
• Tools Required: Vacuum gauge, smoke machine (if available), basic hand tools.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Remove the MAF sensor carefully by unscrewing the mounting screws.
  3. Clean the sensor with MAF cleaner spray. Allow it to dry completely before reinstallation.
  4. If cleaning does not resolve the issue, replace the MAF sensor with a new one.
• Tools Required: Screwdriver set, MAF cleaner.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition key to the "ON" position (do not start the engine) and check the fuel pressure reading.
  3. If the pressure is below specifications, check the fuel pump and filter for proper operation. Replace as necessary.
• Tools Required: Fuel pressure gauge.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Inspect each injector for clogs or leaks.
  3. Clean injectors with a suitable injector cleaner, or replace them if necessary.
• Tools Required: Socket set, injector cleaning kit.

6. Check ECT Sensor

• Sub-steps:
  1. Locate the ECT sensor on the engine.
  2. Disconnect the electrical connector and remove the sensor.
  3. Test the sensor's resistance with a multimeter according to specifications. Replace if out of range.
• Tools Required: Multimeter, socket set.