how to fix P0174 code on Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Remove the engine cover if applicable.
  • Visually inspect the air intake duct for cracks or loose clamps.
  • Use a smoke machine or carburetor cleaner to check for vacuum leaks.
  • If leaks are found, replace the damaged part (duct or hoses).

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake path.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor with MAF cleaner spray and let it dry.
  • If damaged, replace it with a new sensor and reconnect it.

4. Check and Replace Fuel Pump or Filter (if necessary)

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition on (do not start) and check the pressure reading.
  • If the pressure is below specifications, replace the fuel filter and/or fuel pump as needed.
  • Reconnect all lines securely after repairs.

5. Inspect Vacuum Hoses

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold.
  • Replace any frayed or cracked hoses.
  • Ensure all connections are tight and secure.

6. Check Oxygen Sensors

• Sub-steps:
  • Using a multimeter, check the voltage output of the upstream oxygen sensor.
  • If readings are outside the normal range, replace the sensor.
  • Reconnect the sensor after replacement.