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

Solution

1. Preparation

• Gather 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 shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Screwdriver set, vacuum gauge
• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a vacuum gauge to test the intake manifold for leaks.
  3. Replace any damaged hoses with OEM parts.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF cleaner, screwdriver set
• Sub-steps:
  1. Locate the MAF sensor in the air intake between the air filter and throttle body.
  2. Disconnect the wiring harness and remove the sensor using the appropriate screwdriver.
  3. Clean the sensor with MAF cleaner to remove dirt and debris. Allow it to dry completely.
  4. Reinstall the sensor and reconnect the wiring harness.

4. Check and Clean the Throttle Body

• Tools Required: Throttle body cleaner, cloths, screwdriver set
• Sub-steps:
  1. Remove the intake duct connected to the throttle body.
  2. Inspect the throttle body for carbon buildup; use throttle body cleaner to remove deposits.
  3. Ensure the throttle plate moves freely and reassemble the intake duct.

5. Test Fuel System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (without starting the engine) to check fuel pressure.
  3. Ensure the pressure readings are within manufacturer specifications; replace the fuel pump if necessary.

6. Replace Oxygen Sensor (if necessary)

• Tools Required: O2 sensor socket, wrench set
• Sub-steps:
  1. Locate the Bank 2 oxygen sensor (usually after the catalytic converter).
  2. Disconnect the wiring harness and unscrew the sensor using an O2 sensor socket.
  3. Install the new oxygen sensor and reconnect the wiring harness.