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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical shocks.

2. Inspect and Repair Air Intake System

• Tools Required: Vacuum gauge, flashlight, basic hand tools
• Inspect all air hoses and connections for cracks or leaks. Replace any damaged components.
• Use a vacuum gauge to check for vacuum leaks; repair as necessary.
• Inspect the air filter and replace if clogged.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner
• Remove the MAF sensor from the air intake duct.
• Spray the MAF sensor with a dedicated cleaner. Allow it to dry completely before reinstallation.
• Reinstall the MAF sensor, ensuring it is properly seated.

4. Check 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 without starting the engine. Check the fuel pressure reading against manufacturer specifications (typically around 40-50 psi for Honda).
• If the pressure is low, inspect the fuel pump and fuel filter for issues.

5. Inspect Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if needed)
• Remove the fuel rail and inspect the injectors for leaks or clogs.
• If necessary, clean or replace the fuel injectors. Ensure proper sealing upon reinstallation.

6. Replace ECT Sensor (if faulty)

• Tools Required: Socket set, torque wrench
• Locate the ECT sensor, usually near the thermostat housing.
• Disconnect the electrical connector and remove the sensor.
• Install the new ECT sensor and torque to manufacturer specifications (typically around 15 ft-lbs).
• Reconnect the electrical connector.