how to fix the P0174 code on my Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool to avoid burns.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Sub-steps:
  1. Visually inspect the entire air intake system from the air filter to the throttle body.
  2. Tighten any loose clamps and replace damaged hoses.
  3. Replace any cracked or broken intake components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove MAF sensor from the air intake duct.
  3. Spray MAF cleaner on the sensor elements and let it dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the test port.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure.
  3. Compare the reading with manufacturer specifications (typically around 40-50 psi).
  4. If pressure is low, inspect the fuel pump, filter, and relay for issues.

5. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench
• Sub-steps:
  1. Locate the Bank 2 oxygen sensor (usually after the catalytic converter).
  2. Disconnect the electrical connector.
  3. Use an O2 sensor socket to remove the old sensor.
  4. Install the new sensor and reconnect the electrical connector.
  5. Repeat for any other faulty sensors if applicable.

6. Check PCV System

• Tools Required: None specifically
• Sub-steps:
  1. Locate the PCV valve and hoses.
  2. Remove the PCV valve and check for blockages by shaking it; it should rattle.
  3. Replace the PCV valve if it is faulty.
  4. Inspect and replace any damaged hoses connected to the valve.