my Toyota Tacoma N300 (2016-Present) has a check engine light and code P0174, what does it mean?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Inspect the air filter for blockage; replace if necessary.
• Check all intake hoses for cracks or disconnections; replace any damaged hoses.
• Tighten any loose clamps and ensure gaskets are properly seated.

3. Check Fuel System

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine and check the pressure reading against the manufacturer's specifications.
• If pressure is low, inspect the fuel pump and filter for clogs or failure; replace as needed.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake duct.
• Clean the sensor gently with MAF cleaner or isopropyl alcohol; allow it to dry completely before reinstalling.
• If the sensor is faulty, replace it with a new one.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Locate the upstream and downstream oxygen sensors.
• Use the O2 sensor socket to remove the sensors.
• Test the sensors with a multimeter to ensure they meet manufacturer specifications; replace if they fail the test.