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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, basic hand tools.
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Use a vacuum gauge to test the intake system for leaks.
• Replace any damaged hoses or secure loose connections.

3. Clean the Mass Air Flow Sensor

• Tools Required: MAF cleaner, soft cloth, screwdriver.
• Locate the MAF sensor on the intake manifold.
• Remove the MAF sensor gently by unscrewing it from its housing.
• Spray the MAF cleaner onto the sensor elements, avoiding physical contact.
• Let it dry completely before reinstallation.

4. Check and Replace Fuel Filter (if necessary)

• Tools Required: Fuel line disconnect tool, wrenches, catch basin.
• Locate the fuel filter and relieve fuel pressure by disconnecting the fuel pump fuse and starting the engine until it stalls.
• Disconnect the fuel lines using the fuel line disconnect tool.
• Remove and replace the fuel filter with a new one, ensuring proper orientation and secure connections.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter or OBD-II scanner.
• Locate the oxygen sensors (upstream and downstream).
• Use a multimeter to test the voltage output of the sensors while the engine is running.
• Replace any faulty oxygen sensors based on the test results.