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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Air Leaks

• Sub-steps:
  1. Visually inspect the intake manifold gasket for wear or damage.
  2. If damaged, remove the intake manifold to replace the gasket.
     • Tools Required: Socket set, torque wrench, gasket scraper.
     • Safety Warning: Allow engine to cool before starting the procedure.
  3. Replace any cracked or brittle vacuum hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct.
  2. Clean the MAF sensor using MAF cleaner spray.
  3. If cleaning does not improve performance, replace the MAF sensor.
     • Tools Required: Torx or Phillips screwdriver.
     • Safety Warning: Avoid touching the sensor with fingers to prevent contamination.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
  3. If the pressure is below specifications, check the fuel pump and filter for issues, replacing them if necessary.
     • Tools Required: Fuel pressure gauge, socket set.
     • Safety Warning: Relieve fuel system pressure before disconnecting components.

5. Reset the Engine Control Module (ECM)

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the engine and allow it to idle for a few minutes.
  3. Use the OBD-II scanner to clear the P0174 code.