how to fix P0174 code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, vacuum gauge, fuel pressure gauge, basic hand tools (sockets, wrenches), and a cleaning solution for sensors.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Step 1: Visually inspect all air intake hoses and connections for cracks or leaks.
• Step 2: If leaks are found, replace damaged hoses using appropriate clamps.
• Step 3: Ensure the air filter is clean and properly installed.

3. Clean or Replace MAF Sensor

• Step 1: Locate the MAF sensor, typically found between the air filter and throttle body.
• Step 2: Disconnect the electrical connector and remove the sensor.
• Step 3: Clean the MAF sensor with a dedicated MAF cleaner and allow it to dry before reinstalling. If damaged, replace with a new sensor.

4. Check Fuel System

• Step 1: Connect a fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position (do not start the engine) to check for proper fuel pressure (usually around 30-40 psi for most Honda models).
• Step 2: If pressure is low, inspect the fuel pump, filter, and lines for issues and replace as necessary.
• Step 3: If fuel injectors are suspected to be clogged, clean or replace them as needed.

5. Inspect Vacuum Lines

• Step 1: Use a vacuum gauge to check for proper vacuum levels (should typically be around 18-22 inHg at idle).
• Step 2: Replace any cracked or disconnected vacuum hoses.

6. Oxygen Sensor Inspection

• Step 1: Inspect the wiring and connectors of the oxygen sensors for damage or corrosion.
• Step 2: Use a multimeter to check the oxygen sensor's voltage output to ensure it is functioning properly; replace if necessary.