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

Solution

1. Preparation

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

2. Inspect for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or propane torch (not lit) to find leaks around the intake area.
  3. Repair or replace any damaged hoses or gaskets found during inspection.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the sensor.
  3. Carefully remove the MAF sensor from the duct.
  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 Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and find the Schrader valve.
  2. Connect the fuel pressure gauge to the valve.
  3. Turn the ignition key to the “ON” position (do not start) and check the reading.
  4. Remove the gauge and compare the pressure to the specifications in the service manual. Replace the fuel pump if pressure is below specifications.

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Locate the upstream oxygen sensor on the exhaust manifold.
  2. Disconnect the electrical connector.
  3. Use an O2 sensor socket to remove the sensor from the exhaust.
  4. Inspect the sensor for damage or contamination. Replace if necessary.
  5. Reinstall the new (or cleaned) sensor and reconnect the electrical connector.

6. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0171 code.
  3. Start the engine and perform a test drive to monitor the vehicle's performance.