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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check all air intake hoses for cracks or loose connections. Replace any damaged hoses.
• Inspect the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace Mass Air Flow (MAF) Sensor

• Tools Required: MAF sensor cleaner or electrical cleaner
• Remove the MAF sensor from the intake duct.
• Spray the sensor with MAF cleaner to remove dirt and debris. Allow it to dry completely.
• Reinstall the MAF sensor ensuring it is securely fastened.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading.
• If pressure is below manufacturer specifications, inspect the fuel pump and filter for issues.

5. Inspect and Repair Oxygen Sensors

• Tools Required: O2 sensor socket or wrench
• Locate the upstream (pre-catalytic converter) oxygen sensor.
• Disconnect the sensor and use the appropriate tool to remove it.
• Inspect the sensor for signs of damage or corrosion. Replace if necessary.
• Reinstall the new or cleaned sensor and ensure all connections are secure.