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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Tools Required: OBD-II scanner, fuel pressure gauge, socket set, screwdriver set, MAF sensor cleaner, multimeter.

2. Inspect and Repair Air Intake System

• Inspect for Leaks:
  • Visually check all hoses and connections for signs of wear or damage.
  • Use a smoke machine or soapy water to identify any leaks.
• Repair or Replace:
  • Repair or replace any damaged hoses or gaskets found during inspection.

3. Check and Clean MAF Sensor

• Remove MAF Sensor:
  • Disconnect the electrical connector.
  • Unscrew the mounting screws and carefully remove the sensor from the intake.
• Clean the MAF Sensor:
  • Use MAF sensor cleaner to spray the sensing elements. Do not touch them with fingers or any objects.
• Reinstall MAF Sensor:
  • Allow it to dry completely before reinstalling.
  • Secure the sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Attach Fuel Pressure Gauge:
  • Locate the fuel rail and attach the gauge according to manufacturer instructions.
• Check Pressure:
  • Compare the reading to Honda's specifications (typically around 40-50 psi for most models). If low, inspect the fuel pump and filter.
• Replace Fuel Filter if Necessary:
  • If the filter is clogged, replace it following manufacturer guidelines.

5. Inspect and Test Oxygen Sensors

• Check Connections:
  • Inspect the wiring and connector for the upstream and downstream oxygen sensors.
• Test Sensors:
  • Use a multimeter to check for proper operation. Consult the service manual for resistance specifications.
• Replace if Faulty:
  • Remove the faulty sensor using an oxygen sensor socket and install a new one if required.