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

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, vacuum gauge, multimeter, fuel pressure gauge, basic hand tools, and replacement parts as needed.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a vacuum gauge to measure the vacuum level at idle; it should be within manufacturer specifications.
  3. If leaks are found, replace damaged hoses or gaskets as necessary.

3. Check and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail to measure the fuel pressure.
  2. Compare the reading to the manufacturer's specifications. If pressure is low, check the fuel pump and filter.
  3. If fuel injectors are clogged, remove and clean them using an ultrasonic cleaner, or replace them if necessary.

4. Test and Clean MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector and remove the sensor from the intake.
  2. Use MAF cleaner to clean the sensing elements without touching them.
  3. Reinstall the sensor and connector, ensuring a secure fit.

5. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0174 code.
  3. Start the engine and take the vehicle for a test drive to ensure proper operation.