how to fix P0174 code Honda Civic 10th Generation (2016-2021)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool if it has been running recently.

2. Inspect and Repair Intake System

• Sub-steps:
  1. Remove the air intake duct to access the throttle body and MAF sensor.
  2. Inspect the duct for cracks or loose clamps; replace or secure as needed.
  3. Clean the MAF sensor with MAF cleaner; do not touch the sensor element.
  4. Reinstall the air intake duct securely.

3. Check and Replace Fuel Filter (if applicable)

• Sub-steps:
  1. Locate the fuel filter, typically along the fuel line.
  2. Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  3. Disconnect the fuel lines from the filter using a fuel line disconnect tool.
  4. Remove the fuel filter and install the new one, ensuring the flow direction matches the markings.
  5. Reconnect the fuel lines securely and restore fuel pump operation.

4. Inspect Vacuum Lines and Gaskets

• Sub-steps:
  1. Visually inspect and feel for any cracks or disconnections in the vacuum lines.
  2. Replace any damaged vacuum hoses with new ones.
  3. Check the intake manifold gasket for leaks; replace if necessary.

5. Verify Oxygen Sensor Functionality

• Sub-steps:
  1. Use a multimeter to test the output voltage of the O2 sensor; it should fluctuate between 0.1V and 0.9V.
  2. Replace any faulty oxygen sensors with OEM or high-quality aftermarket parts.
  3. Reconnect any wiring harnesses or connectors that may have been disturbed.