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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum lines for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to locate leaks.
  3. Replace any damaged or disconnected hoses.

3. Clean the Mass Airflow Sensor (MAF)

• Tools Required: MAF cleaner or electronic cleaner.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the MAF sensor electrical connector.
  3. Remove the MAF sensor from the duct.
  4. Spray the MAF sensor with cleaner and allow it to dry completely before reinstalling.

4. Test and Replace Fuel Components if Necessary

• Sub-steps:
  1. Check the fuel pressure using a fuel pressure gauge. Ensure it meets specifications (typically around 30-50 psi for Honda Civic).
  2. If fuel pressure is low, inspect the fuel pump and replace it if faulty.
  3. Replace the fuel filter if it is clogged or has not been changed according to maintenance schedules.

5. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors (usually near the exhaust manifold and catalytic converter).
  2. Check the wiring and connectors for damage.
  3. If necessary, replace the faulty oxygen sensor with a new one, ensuring it is torqued to manufacturer specifications.