how to fix the P0171 code on my Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Leaks

• Tools Required: Screwdriver set, pliers.
• Visually inspect all vacuum hoses and connections.
• Use carburetor cleaner or a smoke machine to check for leaks. Spray around suspected areas while the engine is running; a change in RPM indicates a leak.
• Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner.
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the intake.
• Clean the MAF sensor with the designated cleaner, allowing it to dry completely.
• If cleaning does not resolve issues, replace the MAF sensor with a new one.

4. Test and Adjust Fuel System

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "ON" position (do not start) to check fuel pressure.
• Compare the reading with the specifications in the service manual. If pressure is low, check the fuel pump and filter; replace if necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if necessary).
• Remove the fuel injectors from the fuel rail.
• Clean the injectors using the cleaning kit, or replace them if they are clogged or malfunctioning.