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

Solution

1. Preparation

• Gather all tools and parts required.
• Disconnect the vehicle's negative battery terminal to ensure safety.
• Allow the engine to cool before starting any work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, screwdriver set.
• Check all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to measure the vacuum level; normal levels should be around 18-22 inHg at idle.
• Repair or replace any damaged hoses or connections.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, soft cloth, screwdriver set.
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake duct.
• Clean the sensor using MAF cleaner, following the manufacturer's instructions. Let it dry completely before reinstallation.
• If the MAF sensor is faulty, replace it with a new one.

4. Inspect Fuel System

• Tools Required: Fuel pressure gauge, fuel line disconnect tool.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "ON" position (do not start the engine) to check fuel pressure.
• Ensure that the pressure is within specifications (typically 30-50 psi).
• If the pressure is low, check the fuel pump, fuel filter, and fuel injectors for issues.

5. Reassemble and Test

• Reinstall any components removed during the inspection and repair.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.
• Monitor engine performance and check for any error codes with the OBD-II scanner.