how to fix P0171 code in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to check for leaks if necessary.
  3. Replace any damaged hoses and ensure all connections are secure.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor within the air intake system.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor using MAF cleaner, avoiding physical contact with the sensor element.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Test and Adjust Fuel Pressure

• Sub-steps:
  1. Locate the fuel rail and attach a fuel pressure gauge.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure reading.
  3. Compare the reading to the manufacturer's specifications (typically around 40-50 psi).
  4. If the pressure is low, check the fuel pump and fuel filter for issues and replace as necessary.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel injector electrical connectors and remove the injectors from the fuel rail.
  2. Use a fuel injector cleaner to clean the injectors or replace them if they are clogged.
  3. Reinstall the cleaned or new injectors and reconnect all connections.

6. Verify Engine Coolant Temperature Sensor Function

• Sub-steps:
  1. Locate the coolant temperature sensor and disconnect the electrical connector.
  2. Use a multimeter to check the resistance of the sensor. Compare the resistance values with the specifications in the service manual.
  3. If the sensor is faulty, replace it and reconnect.