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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Safety warning: Disconnect the battery before starting work to avoid electrical shock.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold and throttle body for any signs of wear or damage.
  2. Use a smoke machine or soapy water to check for leaks at the connections.
  3. Replace any damaged hoses or gaskets identified during the inspection.

3. Check Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail’s test port.
  2. Turn the ignition to the "ON" position (do not start the engine) and record the fuel pressure reading.
  3. Compare the reading to the manufacturer's specifications (typically around 43-50 psi for Honda).
  4. If pressure is low, check the fuel pump, fuel filter, and lines for any faults. Replace as necessary.

4. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector and remove the MAF sensor from the air intake.
  2. Clean the sensor using MAF cleaner spray and a soft cloth. Avoid touching the sensor element.
  3. If cleaning does not improve performance, replace the MAF sensor with a new one.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail from the engine while ensuring the fuel system is depressurized.
  2. Inspect fuel injectors for clogs or leaks.
  3. Use a fuel injector cleaner kit to clean the injectors if they are clogged. Otherwise, replace them.

6. Reassemble and Test

• Sub-steps:
  1. Reconnect and reassemble all components removed during the repair.
  2. Reconnect the battery and start the engine.
  3. Check for any leaks and ensure the engine runs smoothly.