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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical issues.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Multimeter
• Socket set
• Torque wrench
• Vacuum gauge

2. Inspect and Repair Vacuum Leaks

• Inspect hoses: Check all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge: Connect the gauge to a vacuum port to check for low vacuum readings.
• Repair or replace any damaged hoses or components found during inspection.

3. Check and Clean MAF Sensor

• Remove MAF sensor: Disconnect the electrical connector and unscrew the sensor from the air intake.
• Clean sensor: Use MAF sensor cleaner to gently spray the sensor elements. Do not touch them with fingers or tools.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Repair Fuel System

• Check fuel pressure: Connect the fuel pressure gauge to the fuel rail and turn the ignition to the ON position (do not start). Ensure fuel pressure is within specifications (usually 30-40 psi).
• Inspect fuel injectors: Remove the fuel rail and check for clogs or leaks in the injectors. Clean or replace as necessary.
• Replace fuel filter if clogged and restricts fuel flow.

5. Replace Oxygen Sensor (if necessary)

• Locate and remove the upstream oxygen sensor from the exhaust manifold.
• Install new sensor: Apply anti-seize compound on the threads of the new sensor and install it to the specified torque (usually around 30-40 ft-lbs).
• Reconnect the electrical connector.