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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:

  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to locate leaks; spray around the intake manifold and hoses.
  3. Replace any damaged hoses or gaskets found during inspection.

• Tools Required: Smoke machine or carburetor cleaner, pliers, replacement hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:

  1. Locate the MAF sensor between the air filter and throttle body.
  2. Disconnect the electrical connector and remove the sensor.
  3. Use MAF sensor cleaner to clean the sensing elements carefully.
  4. If damaged, replace the MAF sensor with a new one.

• Tools Required: Torx screwdriver, MAF sensor cleaner.

4. Check Fuel Pressure

• Sub-steps:

  1. Connect a fuel pressure gauge to the fuel rail's Schrader valve.
  2. Turn the ignition key to the "ON" position (do not start the engine) and check the pressure reading.
  3. If the pressure is below specifications, check the fuel pump and filter; replace as necessary.

• Tools Required: Fuel pressure gauge, socket set.

5. Inspect and Test Oxygen Sensors

• Sub-steps:

  1. Locate the upstream oxygen sensor on bank 2 (usually near the exhaust manifold).
  2. Disconnect the sensor and use a multimeter to check for proper voltage output.
  3. Replace the oxygen sensor if it is not functioning correctly.

• Tools Required: O2 sensor socket, multimeter.