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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the battery to prevent any electrical issues during service.
• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, socket set, MAF cleaner, multimeter.

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to check the intake manifold pressure. A low reading may indicate a leak.
• If a leak is found, replace the affected hose or seal. Ensure all connections are tight.

3. Check and Clean MAF Sensor

• Locate the MAF sensor on the air intake duct.
• Disconnect the electrical connector and remove the sensor from the duct.
• Use MAF cleaner to carefully clean the sensor element. Avoid touching the wires.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Replace Fuel Filter (if necessary)

• Locate the fuel filter; refer to the service manual for specific location.
• Use a fuel pressure gauge to check the fuel pressure. Replace the fuel filter if pressure is below specifications.
• Disconnect the fuel lines carefully, replace the filter, and reconnect the lines, ensuring they are secure.

5. Inspect and Replace Fuel Injectors (if necessary)

• If the fuel pressure is acceptable, remove the fuel rail to access the injectors.
• Inspect injectors for clogs or leaks. Use a multimeter to test their resistance.
• Replace any faulty injectors with new ones, ensuring to properly seat and connect them.