how to fix P0174 code in Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair.
• Allow the engine to cool before starting any work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all intake hoses and connections for cracks or disconnections.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. If the intake manifold gasket is leaking, remove the intake manifold to access the gasket and replace it.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor within the air intake path.
  2. Disconnect the electrical connector and remove the MAF sensor.
  3. Spray the MAF sensor with the appropriate cleaner and allow it to dry before reinstalling.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading.
  3. If the pressure is low, inspect the fuel pump and fuel filter for faults and replace as necessary.

5. Inspect and Replace O2 Sensor

• Sub-steps:
  1. Locate the downstream O2 sensor on Bank 2.
  2. Disconnect the electrical connector and remove the sensor using an O2 sensor socket.
  3. Install the new O2 sensor, ensuring it is tightened to the manufacturer’s specifications.
  4. Reconnect the electrical connector.