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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Use smoke testing or carburetor cleaner to identify any leaks.
  • Replace any damaged hoses or gaskets found during the inspection.
• Tools Required: Smoke machine (optional), car diagnostic tool.

3. Clean the Mass Air Flow (MAF) Sensor

• Sub-steps:
  • Locate the MAF sensor between the air filter and throttle body.
  • Disconnect the electrical connector and remove the sensor using a Torx screwdriver.
  • Clean the sensor using MAF sensor cleaner; do not touch the sensing element.
  • Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: Torx screwdriver, MAF sensor cleaner.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the "ON" position without starting the engine and check pressure readings.
  • Compare the readings with manufacturer specifications (typically around 30-40 psi).
  • If pressure is low, check the fuel pump and fuel filter for issues, replacing them if necessary.
• Tools Required: Fuel pressure gauge, socket set.

5. Inspect and Clean the Throttle Body

• Sub-steps:
  • Remove the intake duct connected to the throttle body.
  • Use throttle body cleaner and a soft cloth to remove carbon deposits inside the throttle body.
  • Ensure the throttle plate moves freely and is not sticking.
  • Reattach the intake duct securely.
• Tools Required: Throttle body cleaner, soft cloth, socket set.