how to fix P0174 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses and connections for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect leaks around the intake manifold and vacuum lines.
• Replace any damaged hoses or gaskets as needed.

3. Check and Clean MAF Sensor

• Locate the MAF sensor in the air intake duct.
• Remove the sensor using a Torx or Phillips screwdriver.
• Clean the MAF sensor with MAF cleaner; avoid touching the sensing element.
• Reinstall the MAF sensor securely.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail's service port.
• Turn the ignition to the "ON" position without starting the engine to check initial fuel pressure.
• Compare the reading to the manufacturer's specifications (usually 40-50 psi for most Toyota engines).
• If the pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or failures.

5. Inspect Fuel Injectors

• Remove the engine cover if necessary to access the fuel rail and injectors.
• Perform a visual inspection for any signs of leakage around the injectors.
• Use a multimeter to check the resistance of the injectors; replace any that are outside the manufacturer’s spec.
• Clean injectors using an ultrasonic cleaner if necessary or replace them if they are clogged.