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

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the engine cover if necessary.
  • Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
  • Reconnect or replace any damaged hoses.
  • Tighten any loose clamps that secure the air intake components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor with a screwdriver.
  • Clean the MAF sensor using an appropriate cleaner, following the product instructions.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Replace Fuel Pressure Regulator (if necessary)

• Tools Required: Fuel pressure gauge, socket set
• Sub-steps:
  • Attach the fuel pressure gauge to the fuel rail.
  • Turn the ignition on (do not start the engine) and check the fuel pressure reading.
  • If pressure is below specifications, inspect and replace the fuel pump or fuel pressure regulator as needed.

5. Inspect and Replace Oxygen Sensor (if necessary)

• Tools Required: O2 sensor socket, wrench
• Sub-steps:
  • Locate the upstream oxygen sensor in the exhaust manifold.
  • Disconnect the electrical connector and use the O2 sensor socket to remove it.
  • Install the new oxygen sensor and reconnect the electrical connector.