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

Solution

1. Preparation

• Gather tools and materials. Ensure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (optional)
• Inspect all vacuum lines and the intake manifold for leaks.
• If using a smoke machine, introduce smoke into the intake system to identify any leaks.
• Repair or replace any faulty hoses or gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver
• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector and remove the MAF sensor by unscrewing it.
• Spray the sensor with MAF cleaner and let it dry completely before reinstallation.
• If cleaning does not resolve the issue, consider replacing the MAF sensor.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail pressure test port.
• Connect the fuel pressure gauge and turn the ignition to the ON position without starting the engine.
• Check the fuel pressure reading against manufacturer specifications (usually around 40-50 psi).
• If pressure is low, inspect the fuel pump and fuel filter for issues.

5. Inspect Fuel Injectors

• Tools Required: O-ring lubricant, multimeter (if testing electrical)
• Check for any visible leaks around the injectors.
• Perform a resistance test on the injectors using a multimeter to ensure they are within specification.
• If they are clogged, remove and clean them or replace them if necessary.

6. Check Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Locate the upstream oxygen sensor and disconnect it.
• Use a multimeter to test the sensor's voltage output while running the engine.
• Replace the oxygen sensor if it is not functioning correctly.