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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts during repairs.
• Ensure the engine is cool before starting any work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Check all hoses connected to the intake for cracks or leaks and replace any damaged hoses.
• Inspect the intake manifold gasket for wear or damage; replace if necessary.
• Reattach any loose connections and ensure all clamps are tight.

3. Clean MAF Sensor

• Tools Required: MAF cleaner (specific cleaner), soft cloth
• Remove the MAF sensor from the air intake.
• Spray the MAF cleaner on the sensor elements without touching them.
• Allow the sensor to dry completely before reinstalling.

4. Test and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check if the fuel pressure matches the specifications in the service manual.
• If the pressure is low, inspect the fuel pump and fuel filter; replace if necessary.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter, O2 sensor socket
• Disconnect the O2 sensor and test its voltage output using a multimeter while the engine is running.
• If the readings are outside of expected range, replace the sensor.