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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off and cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, flashlight
• Instructions:
  1. Visually inspect all air intake hoses for cracks or loose connections.
  2. Tighten any loose clamps; replace any damaged hoses.
  3. Check the intake manifold gasket for leaks and replace if necessary.

3. Test and Adjust Fuel System

• Tools Required: Fuel pressure gauge, screwdriver
• Instructions:
  1. Connect the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition key to the "ON" position without starting the engine. Check the pressure; it should match Honda specifications (typically around 40-50 psi).
  3. If pressure is low, inspect the fuel filter for clogs and replace if necessary.
  4. If pressure is acceptable, proceed to check the fuel injectors for clogs.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth
• Instructions:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the MAF sensor.
  3. Spray MAF cleaner on the sensor element and let it dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

5. Check Oxygen Sensors

• Tools Required: OBD-II scanner, multimeter
• Instructions:
  1. Use an OBD-II scanner to read live data from the upstream O2 sensor.
  2. Check for correct voltage readings (typically fluctuating between 0.1 to 0.9 volts).
  3. If readings are out of range, consider replacing the upstream oxygen sensor.