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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal.
• Ensure the vehicle is on a flat surface and securely raised if required.

2. Inspect and Repair Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Check for any damaged or loose hoses connected to the air intake system.
• Tighten any loose clamps and replace damaged hoses.
• If leaks are found, replace the necessary components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner (or isopropyl alcohol), soft cloth.
• Remove the MAF sensor from the intake tube by unscrewing the mounting screws.
• Spray the MAF sensor with the cleaner and allow it to dry completely before reinstalling.
• If the sensor is damaged, replace it with a new one.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and attach the fuel pressure gauge to the test port.
• Turn the ignition key to the "on" position without starting the engine and check the pressure reading.
• If the pressure is below specifications, check the fuel pump and filter for issues and replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit or replacement injectors.
• Remove the fuel rail to access the fuel injectors.
• Check for clogged or leaking injectors; clean them with an injector cleaning kit or replace them if necessary.
• Reassemble the fuel rail and ensure all connections are secure.