how to fix P0171 code in Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Tools Required: OBD-II scanner, socket set, multimeter, vacuum gauge, fuel pressure gauge, cleaning supplies.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or disconnections.
  2. If any leaks are found, replace the damaged hoses.
  3. Remove the air filter and inspect it for dirt; replace if necessary.
  4. Conduct a smoke test to locate any hidden vacuum leaks.

3. Clean the MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct using a socket set.
  3. Clean the sensor element with MAF cleaner spray; do not touch the sensor element with your fingers.
  4. Allow the sensor to dry completely before reinstalling.

4. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "ON" position (do not start the engine) to check the fuel pressure; it should be within the manufacturer's specifications.
  3. If the pressure is low, inspect and replace the fuel pump or fuel filter if necessary.
  4. Test each fuel injector for proper operation using a multimeter.

5. Reassemble and Reconnect

• Reinstall the MAF sensor and reconnect the electrical connector.
• Reattach all air intake components and ensure all clamps are tight.
• Reconnect the battery.