how to fix P0171 code in my Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, cleaning supplies, multimeter, vacuum gauge.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake duct and hoses for cracks or damage.
  2. Tighten any loose clamps or connections.
  3. Replace any damaged components as needed.

3. Clean the Mass Air Flow Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector and remove the sensor.
  3. Use MAF sensor cleaner to clean the sensor elements.
  4. Allow the sensor to dry completely before reinstalling it.

4. Check and Adjust Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "ON" position (do not start) and observe the pressure reading.
  3. If the pressure is below specifications, check the fuel pump and fuel filter.
  4. Replace the fuel filter if clogged and consider replacing the fuel pump if necessary.

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Use a multimeter to test the oxygen sensors for proper voltage output.
  2. Replace faulty oxygen sensors if readings are out of specifications.
  3. Clear the P0171 code using the OBD-II scanner after repairs.