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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Fuel pressure gauge
• Multimeter
• MAF sensor cleaner (if applicable)

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Visually inspect all intake hoses for cracks or leaks.
  3. Tighten any loose clamps and replace damaged hoses.
  4. Use a smoke machine to detect any hidden vacuum leaks if necessary.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Use MAF sensor cleaner to gently clean the sensor element.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Fuel Pressure Test

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the "On" position (do not start) and check the fuel pressure.
  4. Ensure the pressure is within specifications (typically around 40-50 psi). If low, inspect the fuel pump and filter.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the fuel injector connectors.
  3. Use a multimeter to check the resistance of each injector.
  4. If injectors are clogged, consider cleaning or replacing them.
  5. Reconnect all components properly.