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

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses.
• Check the intake manifold gasket for leaks and replace if necessary.
• Reassemble any removed components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth.
• Remove the air intake duct to access the MAF sensor.
• Spray MAF cleaner on the sensor elements, avoiding contact with the wires.
• Allow the sensor to dry completely before reinstallation.
• If cleaning doesn't work, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position and check the pressure; it should meet specifications (typically 40-50 psi).
• If pressure is low, inspect the fuel pump and fuel filter.
• Replace the fuel filter if clogged and consider replacing the fuel pump if necessary.

5. Inspect ECT Sensor

• Tools Required: Multimeter.
• Locate the ECT sensor and disconnect the electrical connector.
• Use a multimeter to check the resistance of the sensor; compare it to manufacturer specifications.
• Replace the ECT sensor if it is out of spec.