how to fix P0174 code in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool before starting any work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, screwdriver set
• Visually inspect all hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to test for leaks by connecting it to a vacuum source and noting any fluctuations.
• Replace any damaged hoses or gaskets as necessary.

3. Fuel Delivery System Inspection

• Tools Required: Fuel pressure gauge, socket set
• Remove the fuel pump fuse and start the engine to relieve fuel pressure.
• Connect the fuel pressure gauge to the fuel rail and turn the ignition key to the "ON" position (do not start the engine).
• Check if the fuel pressure is within the manufacturer’s specifications (usually around 40-50 psi for most Honda models).
• If pressure is low, consider replacing the fuel pump or fuel filter.

4. Clean or Replace the MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth, socket set
• Locate the MAF sensor on the air intake duct.
• Remove the sensor carefully to avoid damage.
• Clean the sensor with MAF cleaner or isopropyl alcohol and a soft cloth. Let it dry before reinstallation.
• If cleaning does not resolve the issue, replace the MAF sensor.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner, multimeter, socket set
• Remove the intake manifold to gain access to the fuel injectors.
• Test each injector's resistance using a multimeter; replace any that fall outside of the specified range.
• If clogged, use an injector cleaning kit or replace the injectors as necessary.

6. Check Engine Coolant Temperature Sensor

• Tools Required: Multimeter, socket set
• Locate the ECT sensor, usually near the thermostat housing.
• Disconnect the sensor and test its resistance with a multimeter according to the manufacturer’s specifications.
• Replace the sensor if it is faulty or out of range.