how to fix P0171 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect the air intake hoses and connections for cracks or loose fittings.
  • Tighten any loose clamps and replace any damaged hoses.
  • If the air filter is dirty, replace it.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the MAF sensor.
  • Use MAF cleaner to clean the sensor elements; allow to dry completely before reinstalling.
  • If the MAF sensor is faulty, replace it with a new one.

4. Test Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel line at the engine.
  • Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading against manufacturer specifications (typically around 40-50 psi).
  • If the pressure is low, check the fuel pump and fuel filter for issues.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the engine cover if necessary to access the fuel injectors.
  • Visually inspect the injectors for any signs of leaks or damage.
  • If clogged, clean the injectors using a specialized cleaner or replace them if necessary.

6. Check for Vacuum Leaks

• Sub-steps:
  • Inspect all vacuum hoses connected to the intake manifold.
  • Use a smoke machine or carburetor cleaner around vacuum connections to identify leaks.
  • Replace any damaged hoses or sealant as needed.