how to fix P0174 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

1. Visual Inspection: Examine the air intake hoses for any visible damage or loose connections.
2. Vacuum Leaks: Use a smoke machine or carburetor cleaner to detect vacuum leaks around the intake manifold and hoses.
3. Repair or Replace:
   • Tighten any loose clamps or connections.
   • Replace any damaged hoses or components.

3. Clean or Replace MAF Sensor

1. Removal: Disconnect the electrical connector and remove the MAF sensor from the air intake duct.
2. Cleaning: Use MAF cleaner spray to clean the sensor. Do not touch the sensor elements.
3. Reinstallation: Reinstall the MAF sensor securely and reconnect the electrical connector.

4. Fuel System Inspection

1. Check Fuel Pressure:
   • Connect a fuel pressure gauge to the fuel rail test port.
   • Turn the ignition to the "ON" position (do not start) and check the pressure; it should be within manufacturer specifications (usually around 35-50 psi).
2. Replace Fuel Filter: If pressure is low, consider replacing the fuel filter if it hasn't been replaced recently.
3. Inspect Fuel Injectors: Remove the injectors and clean or replace them if clogged.

5. Clear Codes and Test Drive

1. Clear the Code: Use the OBD-II scanner to clear the P0174 code.
2. Test Drive: Drive the vehicle for a short distance to monitor for any reoccurrence of the code.