what does it mean if my Honda Accord Eleventh Generation (2023-present) displays a P0171 code?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and securely lifted if needed.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and connections for cracks or wear.
  2. Remove and replace any damaged hoses or gaskets.
  3. Ensure the air filter is clean and replace it if necessary.

3. Fuel System Pressure Check

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail's service port.
  2. Turn the ignition to the "ON" position (without starting the engine) and observe the pressure reading; it should match manufacturer specifications.
  3. If pressure is low, inspect the fuel pump and fuel filter for issues and replace as needed.

4. MAF Sensor Cleaning or Replacement

• Sub-steps:
  1. Locate the MAF sensor in the intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor using MAF sensor cleaner; do not touch the sensing element.
  4. Reinstall the MAF sensor, reconnect the electrical connector, and ensure it is properly secured.

5. ECT Sensor Inspection

• Sub-steps:
  1. Locate the engine coolant temperature sensor (usually near the thermostat).
  2. Disconnect the electrical connector and check resistance with a multimeter against manufacturer specifications.
  3. Replace the ECT sensor if readings are outside of specifications.