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

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, socket set
• Check all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• Inspect the intake manifold gaskets for leaks and replace if necessary.
• Use a vacuum gauge to test for any abnormal readings; if low, further inspect the intake system.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner spray, screwdriver
• Remove the MAF sensor from the air intake duct.
• Spray the sensor with MAF cleaner and allow it to dry completely before reinstalling.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Delivery

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the 'ON' position (without starting) to check the fuel pressure. Compare the reading to the manufacturer specifications.
• If the pressure is low, inspect and replace the fuel filter and test the fuel pump.

5. Inspect Oxygen Sensor

• Tools Required: O2 sensor socket
• Locate the bank 2 oxygen sensor and remove it using the O2 sensor socket.
• Inspect the sensor for damage or corrosion. If faulty, replace with a new oxygen sensor.
• After replacement, reconnect the battery and clear the codes using the OBD-II scanner.