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

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, torque wrench, cleaning spray.
• Clear any stored error codes using the OBD-II scanner.
• Ensure the engine is cool and parked on a level surface.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or disconnections.
  2. Tighten any loose connections and replace damaged hoses.
  3. Use cleaning spray to clean the air intake area.
  4. Reassemble and ensure all clamps are secure.

3. Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector carefully.
  3. Remove the MAF sensor using the appropriate socket.
  4. Spray MAF cleaner on the sensor elements and allow it to dry completely.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Sub-steps:
  1. Locate the fuel rail and attach the fuel pressure gauge.
  2. Turn the ignition to the ON position without starting the engine to check the pressure.
  3. Compare the reading to manufacturer specifications (usually around 40-50 psi).
  4. If the pressure is low, inspect the fuel pump and fuel filter for issues.

5. Clean Throttle Body

• Sub-steps:
  1. Remove the throttle body from the intake manifold using a socket set.
  2. Use throttle body cleaner and a soft cloth to remove carbon buildup.
  3. Ensure the throttle plate moves freely and reinstall the throttle body with the specified torque.

6. Test Fuel Injectors

• Sub-steps:
  1. Remove the electrical connectors from each fuel injector.
  2. Use a multimeter to check the resistance of each injector (should be within manufacturer specifications).
  3. Replace any faulty injectors.