how to fix Honda Accord 8th Generation (2008-2012) check engine light P0174

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle if necessary and ensure proper safety measures are taken.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold and throttle body.
  • Listen for hissing sounds while the engine is running, indicating a vacuum leak.
  • Replace any damaged or cracked hoses.
  • Use a smoke test if necessary to identify hard-to-find leaks.

3. Clean the Mass Air Flow Sensor

• Tools Required: MAF cleaner
• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Spray MAF cleaner onto the sensor elements without touching them.
  • Allow the sensor to dry completely before reinstallation.
  • Reinstall the MAF sensor ensuring a tight fit to avoid leaks.

4. Test and Replace Fuel Pressure Regulator (if needed)

• Tools Required: Fuel pressure gauge
• Sub-steps:
  • Attach the fuel pressure gauge to the fuel rail.
  • Start the engine and observe the pressure readings. It should be within the manufacturer's specifications.
  • If the pressure is low, check the fuel filter and replace it if clogged.
  • If necessary, replace the fuel pressure regulator.

5. Repair or Replace PCV Valve

• Sub-steps:
  • Locate the PCV valve, typically on the valve cover or intake manifold.
  • Remove the PCV valve and inspect it for blockages.
  • Clean the valve with solvent or replace it if it appears faulty.
  • Reinstall the PCV valve ensuring a secure fit.