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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to identify leaks.
  • Replace any damaged hoses or gaskets identified during inspection.
• Tools Required: Smoke machine or carburetor cleaner, pliers.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor, which is typically positioned between the air filter and throttle body.
  • Disconnect the electrical connector and remove the sensor from the air duct.
  • Clean the MAF sensor using MAF sensor cleaner; do not touch the sensor element.
  • Reinstall the sensor and reconnect the electrical connector. If damaged, replace with a new sensor.
• Tools Required: Torx or Phillips screwdriver, MAF sensor cleaner.

4. Check and Repair Fuel Delivery System

• Sub-steps:
  • Use a fuel pressure gauge to check the fuel pressure; compare it against the manufacturer's specifications.
  • If pressure is low, inspect the fuel pump and fuel filter for clogs or failures.
  • Replace the fuel filter if it's clogged, and ensure the fuel pump is functioning correctly.
• Tools Required: Fuel pressure gauge, socket set.

5. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the upstream oxygen sensor on bank 2 (usually before the catalytic converter).
  • Disconnect the electrical connector and use an oxygen sensor socket to remove the sensor.
  • Install a new oxygen sensor and reconnect the electrical connector.
• Tools Required: Oxygen sensor socket, wrench.