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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Multimeter
• Socket set
• Screwdrivers
• MAF cleaner (if applicable)

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold.
• Use a smoke machine or carburetor cleaner to identify leaks; apply around suspected areas and watch for changes in engine RPM.
• Replace any damaged hoses or gaskets.

3. Check and Clean MAF Sensor

• Locate the MAF sensor; it's usually positioned between the air filter and throttle body.
• Disconnect the electrical connector and remove the MAF sensor.
• Clean the sensor with MAF cleaner, allowing it to dry completely before reinstalling.
• Reconnect the sensor and ensure it is securely fastened.

4. Test Fuel Pressure

• 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.
• Refer to the manufacturer's specifications for correct fuel pressure levels. If low, inspect the fuel pump and filter for issues and replace if necessary.

5. Inspect Fuel Injectors

• Remove the fuel rail to access the fuel injectors.
• Visually inspect for leaks or clogs; clean or replace injectors as needed.
• Reinstall the fuel rail and ensure all connections are secure.

6. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0171 code and any other stored codes.
• Start the vehicle and observe if the check engine light remains off.