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

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid any electrical issues.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or disconnections.
  2. Use a smoke machine or soapy water to detect leaks at connections.
  3. Replace any damaged hoses or clamps as necessary.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector.
  3. Remove the MAF sensor using a screwdriver.
  4. Spray the MAF sensor with MAF cleaner, avoiding touching the sensor element.
  5. Allow it to dry and reinstall the sensor.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
  3. Compare the reading to the manufacturer specifications (typically around 50-60 psi).
  4. If low, inspect the fuel pump and filter for issues.

5. Inspect Oxygen Sensors

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors.
  3. Use a multimeter to test the sensor's voltage output (should fluctuate between 0.1 to 0.9 volts for a functioning sensor).
  4. Replace any sensors that fail the test.