how to fix P0174 code in Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers, silicone sealant
• Visually inspect all vacuum hoses for wear or damage.
• Use a vacuum gauge to test for leaks; if a leak is found, replace the damaged hose or seal.
• Recheck all connections to ensure they are secure and tight.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Locate the MAF sensor in the air intake duct.
• Disconnect the electrical connector and remove the sensor using a screwdriver.
• Spray MAF sensor cleaner onto the sensor element and let it dry completely.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "ON" position (do not start the engine) and check the pressure.
• If the pressure is below specifications, inspect the fuel pump and fuel filter; replace as necessary.

5. Inspect and Repair Exhaust Leaks

• Tools Required: Exhaust leak detector or soapy water
• Start the engine and inspect the exhaust system visually for leaks.
• Use the exhaust leak detector or spray soapy water at suspected joint areas; bubbles indicate a leak.
• Repair or replace any damaged exhaust components.

6. Test Fuel Injectors

• Tools Required: Mechanic's stethoscope or a long screwdriver
• While the engine is running, use the mechanic's stethoscope or screwdriver to listen to each fuel injector.
• If a fuel injector is silent or makes an irregular noise, it may need to be cleaned or replaced.