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

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge.
• Remove the air intake duct and inspect for cracks or loose connections.
• Tighten or replace any loose or damaged components.
• Reinstall the air intake duct securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth.
• Locate the MAF sensor in the air intake path.
• Carefully disconnect the electrical connector.
• Remove the MAF sensor using a socket set.
• Clean the sensor using MAF cleaner. Allow it to dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel pressure test port on the fuel rail.
• Attach the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
• Check that the fuel pressure is within manufacturer specifications (typically around 40-50 psi for Honda).
• If pressure is low, consider replacing the fuel pump or checking the fuel filter.

5. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket or wrench.
• Identify the upstream and downstream oxygen sensors.
• Disconnect the electrical connectors and unscrew the sensors.
• Inspect for signs of damage or contamination.
• Replace with new sensors if necessary, ensuring they are properly torqued.

6. Check and Repair Fuel Injectors

• Tools Required: Fuel injector cleaner kit or ultrasonic cleaner.
• Remove the fuel rail with injectors attached.
• Use a fuel injector cleaner to clean each injector or replace them if they are faulty.
• Reassemble the fuel rail and ensure all connections are secure.