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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool before starting work on any components.

2. Inspect and Repair Air Intake System

• Sub-steps:

  • Visually inspect the entire air intake system for cracks or loose connections.
  • Tighten or replace any loose or damaged hoses.
  • Clean the throttle body using throttle body cleaner and a soft cloth.

• Tools Required:

  • Screwdrivers
  • Throttle body cleaner
  • Soft cloth

3. Clean or Replace MAF Sensor

• Sub-steps:

  • Locate the MAF sensor within the air intake duct.
  • Remove the sensor carefully, ensuring not to damage the wiring.
  • Clean the sensor using MAF sensor cleaner and let it dry completely before reinstalling.
  • If damaged, replace with a new MAF sensor.

• Tools Required:

  • Torx or socket set
  • MAF sensor cleaner

4. Test and Repair Fuel System

• Sub-steps:

  • Connect a fuel pressure gauge to the fuel rail and turn the ignition on (do not start) to check fuel pressure.
  • If pressure is low, check the fuel pump, filter, and relay. Replace as needed.
  • Ensure the fuel injectors are clean; consider using a fuel injector cleaner if necessary.

• Tools Required:

  • Fuel pressure gauge
  • Socket set

5. Inspect Oxygen Sensors

• Sub-steps:

  • Check the pre-cat and post-cat oxygen sensors for proper connection and condition.
  • Use a scan tool to monitor live data from the oxygen sensors while the engine is running.
  • Replace any faulty oxygen sensors based on the readings.

• Tools Required:

  • O2 sensor socket
  • Scan tool