how to fix P0171 code on Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, socket set.
• Use a vacuum gauge to check for leaks in the intake manifold and hoses.
• Replace any damaged hoses or gaskets that are allowing air to enter the system.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Disconnect the MAF sensor connector.
• Remove the MAF sensor using a screwdriver.
• Clean the sensor with MAF cleaner; allow it to dry completely before reinstallation.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the ON position (do not start the engine).
• Check the fuel pressure reading against the manufacturer specifications (typically around 40-50 psi); replace the fuel pump or filter if pressure is low.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, cleaning kit, or ultrasonic cleaner.
• Remove the fuel injectors using appropriate tools.
• Clean the injectors using a professional cleaning kit or ultrasonic cleaner.
• Reinstall the cleaned injectors or replace them if they are faulty.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code from the ECM.