how to fix P0174 code in Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and screwdrivers.
• Sub-steps:
  1. Visually inspect all vacuum hoses and connections around the intake manifold.
  2. Use a vacuum gauge to test for leaks; replace any damaged hoses.
  3. Check the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace the Mass Airflow Sensor

• Tools Required: MAF cleaner, Torx screwdriver.
• Sub-steps:
  1. Remove the MAF sensor from the air intake duct.
  2. Clean the sensor elements with MAF cleaner; do not touch the sensor with fingers.
  3. If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge, wrench set.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position without starting the engine and check the pressure.
  3. If pressure is below specifications (refer to manufacturer specs), replace the fuel pump or filter as needed.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit or replacement injectors, socket set.
• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Clean the injectors with the cleaning kit or replace them if they are clogged.
  3. Reinstall the injectors and ensure they are seated properly.

6. Replace Oxygen Sensor (if necessary)

• Tools Required: Oxygen sensor socket, wrench set.
• Sub-steps:
  1. Locate the oxygen sensor on the exhaust system (Bank 2).
  2. Disconnect the wiring harness and unscrew the sensor using the oxygen sensor socket.
  3. Install the new sensor, ensuring the wiring is connected securely.