how to fix P0171 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Clean the Mass Air Flow Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Remove the MAF sensor from the air intake.
• Spray MAF sensor cleaner onto the sensor element and allow it to dry.
• Reinstall the MAF sensor securely.

3. Check for Vacuum Leaks

• Tools Required: Smoke machine or propane torch (without lighting it).
• Use a smoke machine to introduce smoke into the intake system or carefully pass the unlit propane torch near suspected leak areas.
• Look for smoke escaping from any hoses or gaskets.
• Replace or repair any damaged components found.

4. Test the Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel pressure test port on the fuel rail.
• Connect the gauge and turn the ignition to the "On" position without starting the engine.
• Observe the fuel pressure reading; it should meet the manufacturer’s specifications (usually around 40-50 psi).
• If the pressure is low, inspect the fuel pump and filter for issues.

5. Clean or Replace Fuel Injectors

• Tools Required: Injector cleaner, cleaning kit, or replacement injectors.
• If injectors are clogged, use a fuel injector cleaner or remove them for professional cleaning.
• Replace any faulty injectors if necessary.