how to fix P0174 code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather all necessary 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 Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Inspect all vacuum lines for cracks or disconnections. Replace any damaged hoses.
• Check the intake manifold gasket for leaks. If damaged, remove the intake manifold and replace the gasket.
• Reassemble the intake and reconnect all components.

3. Fuel System Inspection and Repair

• Tools Required: Fuel pressure gauge, socket set.
• Connect the fuel pressure gauge to the fuel rail and turn the ignition key to the "ON" position (do not start the engine).
• Check the fuel pressure reading against manufacturer specifications (typically 30-50 psi). If low, inspect the fuel pump and filter; replace if necessary.
• If fuel pressure is adequate, inspect the fuel injectors. Remove and clean or replace any clogged injectors.

4. MAF Sensor Cleaning/Replacement

• Tools Required: MAF cleaner, Torx screwdriver.
• Remove the MAF sensor from the air intake duct using a Torx screwdriver.
• Spray the MAF cleaner onto the sensor element and let it dry completely before reinstalling.
• If the MAF sensor is damaged, replace it with a new unit.

5. Oxygen Sensor Inspection/Replacement

• Tools Required: Oxygen sensor socket, wrench.
• Inspect the oxygen sensors for corrosion or damage. If necessary, replace the upstream (pre-catalytic converter) oxygen sensor.
• Use an oxygen sensor socket to remove the faulty sensor and install the new one, ensuring proper torque specifications (typically 30 ft-lbs).