how to fix P0174 code on my Toyota Highlander XU70 (2020-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 Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Inspect all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• Check the intake manifold gasket for leaks and replace if necessary.
• Ensure the air filter is clean and replace if it is dirty.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth.
• Remove the MAF sensor from the air intake duct.
• Spray the MAF cleaner onto the sensor elements and let it dry completely.
• Reinstall the MAF sensor securely.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail service port.
• Start the engine and check the fuel pressure reading against manufacturer's specifications.
• If pressure is low, check the fuel pump operation and replace if necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, injector cleaning kit (if necessary).
• Remove the fuel injectors from the fuel rail.
• Use a fuel injector cleaner to clean the injectors or replace them if they are faulty.