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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal.
• Allow the engine to cool down before beginning work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carb cleaner to detect leaks.
  3. Replace any damaged hoses or repair leaks in the intake manifold.

3. Clean MAF Sensor

• Tools Required:
  • MAF sensor cleaner
  • Torx screwdriver or appropriate socket
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor from its housing.
  4. Spray the MAF sensor with MAF cleaner and allow it to dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required:
  • Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the test port.
  2. Turn the ignition to the ON position (without starting the engine) and check the pressure reading.
  3. Compare the reading to the manufacturer's specifications; if low, check the fuel pump and filter.
  4. If necessary, replace the fuel pump or filter.

5. Clean Throttle Body

• Tools Required:
  • Throttle body cleaner
  • Socket set
• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Disconnect any electrical connectors and throttle body cables.
  3. Remove the throttle body from the intake manifold.
  4. Clean the throttle body and plate with throttle body cleaner and a soft cloth.
  5. Reinstall the throttle body and reconnect all components.