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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Instructions:
  1. Use a vacuum gauge to check for proper vacuum levels. A reading below normal indicates a leak.
  2. Visually inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses or reattach loose connections.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Instructions:
  1. Locate and disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the intake duct.
  3. Spray MAF sensor cleaner on the sensor element and let it dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Instructions:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "On" position (do not start the engine) and check the fuel pressure reading. It should be within manufacturer specifications.
  3. If the pressure is low, inspect and replace the fuel pump or fuel filter as necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, cleaning kit (if necessary)
• Instructions:
  1. If the injectors are accessible, remove them from the fuel rail.
  2. Use a fuel injector cleaning kit to clean the injectors or replace them if they show signs of damage.
  3. Reinstall the injectors and ensure all connections are secure.

6. Test Oxygen Sensors

• Tools Required: Multimeter
• Instructions:
  1. Locate the upstream oxygen sensor and disconnect it.
  2. Use a multimeter to check the voltage output of the sensor; it should fluctuate between 0.1 to 0.9 volts.
  3. Replace the oxygen sensor if it is not functioning correctly.