how to fix P0174 code Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Clean the MAF Sensor

• Remove the MAF sensor from the air intake duct.
• Use MAF cleaner to spray the sensor elements gently; avoid touching them.
• Reinstall the MAF sensor securely.

3. Repair or Replace Air Intake Hoses

• Visually inspect all air intake hoses for cracks or loose connections.
• If damaged, replace the hoses with OEM or high-quality aftermarket parts.
• Ensure all hose clamps are tight and secure.

4. Check and Repair Vacuum Leaks

• Inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses with new ones.
• Reconnect any loose vacuum lines ensuring a tight fit.

5. Test and Repair Fuel System

• Connect a fuel pressure gauge to the fuel rail to check fuel pressure.
• If pressure is low, inspect the fuel filter, fuel pump, and fuel injectors.
• Replace any faulty components as needed.

6. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0174 code.
• Test drive the vehicle to ensure that the code does not reappear.