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

Solution

1. Preparation

• Gather tools and parts required for repairs.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before working on it.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses and gaskets for signs of wear or disconnection.
  • Use a smoke machine or propane to identify any leaks.
  • Replace any damaged hoses or gaskets found during inspection.
• Tools Required: Smoke machine, propane torch (with caution).
• Safety Warnings: Ensure the area is well-ventilated when using propane.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor on the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor with MAF cleaner following the manufacturer's instructions.
  • If cleaning does not resolve the issue, replace the MAF sensor.
• Tools Required: Torx or socket set, MAF cleaner.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine to check the pressure.
  • If pressure is below the specified range (typically 40-50 PSI), check the fuel pump and filter for issues; replace as necessary.
• Tools Required: Fuel pressure gauge, socket set.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the injectors.
  • Visually inspect injectors for clogs or leaks.
  • Clean the injectors using a cleaning kit or replace them if they are faulty.
• Tools Required: Injector cleaning kit or replacement injectors.

6. Verify ECT Sensor Operation

• Sub-steps:
  • Locate the ECT sensor on the engine.
  • Use a multimeter to check the resistance against the temperature specifications provided in the service manual.
  • Replace the ECT sensor if it is out of specification.
• Tools Required: Multimeter, socket set.