how to fix P0174 code on Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to check for intake leaks if necessary.
  3. Replace any damaged hoses with OEM parts.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition key to the "ON" position (do not start the engine) and note the pressure reading. It should typically be between 40-50 psi for most Honda models.
  4. If pressure is low, check the fuel pump and fuel filter for issues.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or electrical cleaner
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the MAF sensor electrical connector.
  3. Remove the MAF sensor from the duct carefully.
  4. Clean the sensor elements with MAF cleaner or replace it if necessary.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit (if needed)
• Sub-steps:
  1. Remove the fuel rail with injectors attached from the engine.
  2. Inspect each injector for clogs or leaks.
  3. Clean the injectors using an injector cleaning kit or replace them if they are faulty.
  4. Reinstall the fuel rail and reconnect all lines securely.

6. Check Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Use a multimeter to test the voltage output of each sensor (should fluctuate between 0.1V to 0.9V).
  3. If faulty, remove and replace the oxygen sensor(s).