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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, flashlight
• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or loose connections.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. Check the air filter; if dirty, replace it with a new one.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake housing using a screwdriver.
  3. Spray MAF sensor cleaner onto the sensor element and allow it to dry.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Test and Repair Fuel Delivery

• Tools Required: Fuel pressure gauge, wrench
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "On" position without starting the engine and check the fuel pressure.
     • Compare the reading to the manufacturer's specifications (usually around 40-50 psi).
  3. If the pressure is low, inspect the fuel pump and filter for issues and replace as necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Socket set, injector cleaner
• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Inspect each injector for clogs, leaks, or damage.
  3. Use an injector cleaner and follow the manufacturer's instructions for cleaning.
  4. Reinstall the fuel rail and ensure all connections are secure.

6. Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Disconnect the electrical connectors.
  3. Use an O2 sensor socket to remove the sensors from the exhaust system.
  4. Install the new sensors, ensuring they are tightened to the manufacturer’s specifications.
  5. Reconnect the electrical connectors.