how to fix P0171 code in Honda Accord 10th Generation (2018-2022)

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

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold and air intake system for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to locate leaks by spraying around suspected areas while the engine is running.
  • Replace any damaged hoses or seals as needed.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the MAF sensor.
  • Clean the sensor with MAF cleaner spray (do not use other cleaners) and allow it to dry completely.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail and turn the ignition on without starting the engine; check the fuel pressure against manufacturer specifications.
  • If fuel pressure is low, inspect the fuel pump and fuel filter.
  • Test the fuel injectors for proper operation using a noid light or multimeter; replace any faulty injectors.

5. Throttle Body Cleaning

• Sub-steps:
  • Remove the intake duct to access the throttle body.
  • Clean the throttle body with throttle body cleaner and a soft cloth, paying attention to the throttle plate and surrounding areas.
  • Reattach all components and ensure secure connections.