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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical short circuits.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers
• Sub-steps:
  1. Use a vacuum gauge to test the intake manifold for leaks.
  2. Inspect all vacuum hoses for cracks or disconnections; replace any damaged hoses.
  3. Tighten or replace any loose clamps or gaskets at the intake manifold.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct.
  3. Spray MAF cleaner on the sensor element; allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the service port.
  2. Turn the ignition to the "ON" position (do not start the engine) to check for fuel pressure.
  3. Compare the reading to the manufacturer's specifications (typically 40-50 psi); replace the fuel pump if pressure is low.

5. Inspect and Replace Fuel Injectors (if necessary)

• Tools Required: Socket set, fuel injector removal tool
• Sub-steps:
  1. Disconnect the fuel lines and electrical connectors from the fuel injectors.
  2. Remove the fuel rail and pull out the injectors.
  3. Inspect injectors for clogs; clean or replace them as needed.
  4. Reinstall the fuel rail and reconnect all lines and connectors.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code from the ECM.