how to fix P0171 code in Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent any electrical issues during repair.
• Ensure the engine is cool before beginning work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Sub-steps:
  1. Remove the engine cover (if applicable) using the socket set.
  2. Inspect the air intake hoses for cracks or loose connections.
  3. Tighten or replace any damaged hoses.
  4. Check the intake manifold gasket for leaks and replace if necessary.

3. Check and Clean the MAF Sensor

• Tools Required: MAF cleaner, soft brush
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor with a screwdriver or socket.
  4. Clean the sensor using MAF cleaner and allow it to dry completely before reinstallation.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail's test port.
  2. Turn the ignition to the "On" position without starting the engine to check the fuel pressure.
  3. Compare the reading to Honda's specifications (typically around 40-50 psi).
  4. If the pressure is low, inspect the fuel pump, filter, and injectors for issues.

5. Replace Oxygen Sensor (if necessary)

• Tools Required: O2 sensor socket, torque wrench
• Sub-steps:
  1. Locate the upstream oxygen sensor on the exhaust manifold.
  2. Disconnect the electrical connector.
  3. Use an O2 sensor socket to remove the sensor.
  4. Install the new sensor and torque to manufacturer specifications (usually around 30 ft-lbs).
  5. Reconnect the electrical connector.