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

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, multimeter, socket set, screwdrivers, fuel pressure gauge, cleaning supplies.
• Ensure the vehicle is parked on a level surface and the engine is turned off and cool.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Use a vacuum gauge to test for leaks in the intake manifold.
  2. Visually inspect all vacuum hoses connected to the intake manifold.
  3. Replace any cracked or disconnected hoses.
  4. Use a smoke machine or carburetor cleaner spray to identify hard-to-find leaks.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct.
  3. Use MAF cleaner spray to clean the sensor element. Allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. Compare the reading to the manufacturer’s specifications. If low, check the fuel pump and filter.
  4. Inspect the fuel injectors for clogs and ensure proper operation.

5. Replace Engine Coolant Temperature Sensor (if necessary)

• Sub-steps:
  1. Locate the ECT sensor on the engine block.
  2. Disconnect the electrical connector and unscrew the sensor.
  3. Install the new ECT sensor and reconnect the electrical connector.