how to fix P0174 code on Honda Accord 10th Generation (2018-2022)

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts while working.

Tools Required:

• OBD-II scanner
• Vacuum gauge
• Fuel pressure gauge
• Torque wrench
• Basic hand tools (sockets, wrenches, screwdrivers, etc.)

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses for cracks, breaks, or disconnections.
• Use a smoke machine or carburetor cleaner spray to identify leaks around the intake manifold and vacuum lines.
• Replace any damaged hoses or fittings found during inspection.

3. Check Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) and observe the fuel pressure reading.
• Compare the reading with the manufacturer specifications (typically around 40-50 psi for Honda).
• If the pressure is low, check the fuel pump and filter for issues, replacing them as necessary.

4. Clean or Replace MAF Sensor

• Locate the MAF sensor on the air intake duct.
• Disconnect the wiring harness and unscrew the sensor from its housing.
• Clean the MAF sensor using MAF cleaner spray. Do not touch the sensor elements with your fingers or any tools.
• Reinstall the sensor and reconnect the wiring harness.

5. Inspect Fuel Injectors

• Remove the fuel injector connectors and visually inspect for any signs of damage or corrosion.
• Perform a resistance test on each injector using a multimeter to ensure they are within specifications.
• If any injectors are faulty, replace them with new ones.

6. Reassemble and Test

• Reconnect all components and ensure everything is tightened to the specified torque values.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.