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

Solution

1. Preparation

• Tools Required: OBD-II scanner, basic hand tools, multimeter, fuel pressure gauge, cleaning supplies (MAF cleaner).
• Gather necessary parts (if replacement is needed).
• Ensure the vehicle is parked on a flat surface, and the engine is off and cool.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or soapy water to check for leaks in the intake manifold.
  3. Replace any damaged hoses or seals.
  4. Reconnect all components securely.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor harness.
  2. Remove the MAF sensor using a Torx or Phillips screwdriver.
  3. Clean the sensor with MAF cleaner, allowing it to dry.
  4. If damaged, replace the MAF sensor with a new one.
  5. Reinstall the MAF sensor and reconnect the harness.

4. Check Fuel Delivery System

• Sub-steps:
  1. Use a fuel pressure gauge to check fuel pressure; it should match manufacturer specifications.
  2. Inspect fuel injectors for clogs or leaks. Clean or replace as necessary.
  3. Ensure the fuel pump is functioning correctly.

5. Inspect O2 Sensors

• Sub-steps:
  1. Check O2 sensor wiring for damage or corrosion.
  2. Use a multimeter to test the voltage output of the O2 sensors.
  3. Replace any faulty O2 sensors.

6. Reset the ECM

• Sub-steps:
  1. Disconnect the negative battery terminal for approximately 15 minutes.
  2. Reconnect the battery terminal.
  3. Start the engine and allow it to reach operating temperature.