how do I fix the P0174 code on my Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (optional)
• Visually inspect all vacuum hoses and intake gaskets for cracks or disconnections.
• Use a smoke machine to identify any hidden leaks. If none are found, proceed to the next step.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge to the service port.
• Turn the ignition key to the ON position (do not start the engine) and check the fuel pressure reading; it should match the manufacturer's specifications (usually around 50-60 psi).
• If pressure is low, check the fuel pump and filter for issues.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver
• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector and remove the MAF sensor from the duct.
• Spray the sensor with MAF cleaner, avoiding contact with the internal elements, and let it dry completely. Reinstall the sensor.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit or professional service, socket set
• Remove the intake manifold if necessary to access the fuel injectors.
• Use an injector cleaning kit to clean each injector, or if heavily clogged, consider replacing them.

6. Check the PCV System

• Tools Required: Socket set
• Locate the PCV valve and inspect it for blockages or damage.
• If it is faulty, replace the PCV valve with a new one.