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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and basic hand tools.
• Sub-steps:
  1. Use a vacuum gauge to test for leaks in the intake system.
  2. Inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses and ensure all connections are secure.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner.
• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Carefully remove the sensor from its housing.
  3. Spray the sensor with MAF cleaner and let it dry completely before reinstalling.

4. Test and Replace Fuel Pump (if necessary)

• Tools Required: Fuel pressure gauge, basic hand tools.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. If the pressure is below specifications, replace the fuel pump.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit or ultrasonic cleaner.
• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Clean the injectors using a fuel injector cleaning kit or have them professionally cleaned.
  3. Reinstall the injectors and ensure proper sealing.

6. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0171 code.
  3. Test drive the vehicle to ensure the issue is resolved.