how to address Honda Accord 10th Generation (2018-2022) P0171 code?

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, vacuum gauge, basic hand tools (sockets, wrenches).
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake

• Sub-steps:
  1. Visual inspection of the air intake hoses for cracks or loose connections.
  2. Replace any damaged hoses or gaskets.
  3. Tighten all connections to ensure no vacuum leaks.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct.
  2. Clean the sensor with MAF cleaner spray; do not touch the sensor element.
  3. If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel line.
  2. Turn the ignition on (without starting the engine) to check the fuel pressure; it should match the manufacturer's specifications.
  3. If pressure is low, inspect or replace the fuel pump or fuel filter.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Check for any signs of leaking or clogging.
  3. Clean or replace injectors as necessary.

6. Test Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Use a multimeter to test the voltage output of the sensors while the engine is running.
  3. Replace any malfunctioning sensors based on the test results.