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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery before starting work.
• Allow the engine to cool down.

2. Inspect Air Intake System

• Tools Required: Hose clamps, screwdriver, flashlight
• Instructions:
  1. Remove the air intake duct by loosening the hose clamps.
  2. Visually inspect for cracks or loose connections.
  3. Replace any damaged hoses or clamps.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver
• Instructions:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake pipe.
  3. Spray the sensor with MAF cleaner.
  4. Allow it to dry completely before reinstallation.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Instructions:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge and turn the ignition to the "ON" position (do not start).
  3. Verify that the fuel pressure is within the manufacturer's specified range (typically 40-50 psi).
  4. If pressure is low, inspect the fuel pump and filter.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit, multimeter
• Instructions:
  1. Disconnect the fuel injector electrical connectors.
  2. Use a multimeter to check the resistance of each injector (should be within manufacturer’s specs).
  3. If any injectors are faulty, replace them.

6. Examine Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Instructions:
  1. Locate the upstream oxygen sensor.
  2. Use an O2 sensor socket to remove it.
  3. Test the sensor using a multimeter; replace if out of specification.