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

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, socket set.
• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the intake manifold.
  2. If a leak is present, replace any damaged vacuum hoses or gaskets.
  3. Reconnect the battery terminal and clear the P0171 code.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray MAF sensor cleaner on the sensor element and let it dry.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position (without starting the engine) and check the pressure.
  3. If the pressure is below specifications, replace the fuel pump or filter as needed.

5. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench.
• Sub-steps:
  1. Locate the upstream oxygen sensor (before the catalytic converter).
  2. Use an O2 sensor socket to remove the sensor.
  3. Install a new oxygen sensor, tightening to manufacturer specifications (usually around 30 ft-lbs).

6. Final Steps

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.