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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle battery to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, vacuum gauge
• Check all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• Inspect the intake manifold gasket for leaks. Replace if necessary.
• Reassemble the intake components and secure them properly.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver
• Remove the MAF sensor from the intake tube.
• Spray the sensor with MAF cleaner and allow it to dry completely before reinstallation.
• Reinstall the MAF sensor ensuring it is secured properly.

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

• Tools Required: Fuel pressure gauge, socket set
• Attach the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine).
• Check if the fuel pressure meets the manufacturer's specifications (typically 30-40 psi for Honda CR-V).
• If the pressure is low, replace the fuel pressure regulator.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaner, socket set
• Remove the fuel injectors from the fuel rail.
• Use an injector cleaning solution to clean the injectors or replace them if they are faulty.
• Reinstall the injectors and ensure proper sealing.

6. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and let it run for a few minutes to check for any reoccurring codes.