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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Clean the MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver
• Locate the MAF sensor in the intake duct.
• Remove the MAF sensor by unscrewing the mounting screws.
• Spray MAF cleaner onto the sensor elements and allow it to dry completely before reinstallation.

3. Inspect and Repair Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Visually inspect all vacuum lines for cracks or disconnections.
• If using a smoke machine, introduce smoke into the intake system and observe for leaks.
• If leaks are found, replace or repair the damaged hoses.

4. Check Fuel Pressure and Injectors

• Tools Required: Fuel pressure gauge, injector cleaner
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) to check the pressure reading. It should be within the manufacturer's specifications.
• If pressure is low, inspect the fuel pump and filter; replace if necessary.
• Use injector cleaner in the fuel system to clear any potential clogs.

5. Examine Oxygen Sensor

• Tools Required: O2 sensor socket
• Locate the Bank 2 oxygen sensor in the exhaust system.
• Remove the sensor using an O2 sensor socket.
• Inspect the sensor for carbon buildup or damage. Replace it if necessary.
• Reinstall the new sensor and ensure connections are secure.