how to fix a P0174 code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or disconnections.
  2. Tighten any loose clamps.
  3. Replace any damaged hoses with OEM parts.

3. Fuel Pressure Check

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition key to the "ON" position (do not start) to pressurize the system.
  3. Check the fuel pressure reading against the manufacturer's specifications. It should typically be around 50-60 psi.
  4. If pressure is low, inspect the fuel pump and fuel filter for issues and replace as needed.

4. Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Carefully remove the sensor using a Torx screwdriver.
  3. Spray MAF sensor cleaner on the sensor element, avoiding direct contact.
  4. Allow it to dry and reinstall the sensor.

5. Check Oxygen Sensors

• Sub-steps:
  1. Locate the bank 2 oxygen sensor (usually located before the catalytic converter).
  2. Use a multimeter to check the sensor’s voltage output. It should fluctuate between 0.1 to 0.9 volts.
  3. Replace the oxygen sensor if it fails the test.