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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.
• Allow the engine to cool before starting repairs.

2. Inspect for Vacuum Leaks

• Use a smoke machine or carburetor cleaner to detect any vacuum leaks.
• If leaks are found, replace any damaged hoses or gaskets.
• Reconnect all components and clear the check engine light by using the OBD-II scanner.

3. Clean or Replace MAF Sensor

• Remove the MAF sensor from the intake duct.
• Use MAF sensor cleaner to clean the sensor elements carefully. Do not touch the sensor with fingers or tools.
• If the sensor is damaged, replace it with a new one.
• Reinstall the MAF sensor and ensure it is properly connected.

4. Check Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "On" position (do not start the engine) and check the fuel pressure reading; it should be within the manufacturer's specifications (typically around 43-47 psi for Honda).
• If pressure is low, check the fuel pump and fuel filter, replacing them if necessary.

5. Inspect and Clean Fuel Injectors

• Remove the fuel injectors from the fuel rail.
• Use a fuel injector cleaning kit to clean the injectors or replace them if they are clogged or leaking.
• Reinstall the injectors and ensure proper seating and connection.

6. Examine Exhaust System

• Check for any exhaust leaks that may affect the oxygen sensors.
• Repair any leaks found in the exhaust system, especially before the catalytic converter.
• Reinstall any components removed during inspection.