how to fix P0174 code in Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety during the repair.
• Allow the engine to cool before working on any components.

2. Inspect and Repair Intake System

• Sub-steps:
  • Visually inspect all vacuum hoses and connections for cracks or disconnections.
  • Use a smoke machine to identify any leaks in the intake manifold or associated hoses.
  • If any leaks are found, replace the damaged hoses or gaskets.
• Tools Required: Smoke machine, hose clamps, pliers, replacement hoses/gaskets.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor with MAF sensor cleaner; do not touch the sensor elements directly.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new unit.
• Tools Required: Screwdriver set, MAF sensor cleaner.
• Safety Warnings: Ensure the engine is off and the ignition is disconnected.

4. Check and Repair Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail and check that the pressure is within specifications (typically 40-50 psi for most Honda models).
  • If pressure is low, check the fuel pump and fuel filter for clogs or failures; replace as necessary.
• Tools Required: Fuel pressure gauge, socket set, replacement fuel pump/filter if needed.

5. Replace Oxygen Sensor (if necessary)

• Sub-steps:
  • Locate the bank 2 oxygen sensor and disconnect the electrical connector.
  • Remove the old sensor using an oxygen sensor socket or wrench.
  • Install the new oxygen sensor and reconnect the electrical connector.
• Tools Required: Oxygen sensor socket, wrench set.