how to fix P0174 code in Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the vehicle to cool down before working on the engine.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers, replacement vacuum hoses (if needed)
• Sub-steps:
  1. Use a vacuum gauge to check for normal readings.
  2. Visually inspect all vacuum hoses for cracks or leaks.
  3. Replace damaged hoses with new ones and secure with hose clamps.

3. Test and Clean MAF Sensor

• Tools Required: MAF sensor cleaner, torx screwdriver
• Sub-steps:
  1. Remove the MAF sensor from the air intake duct.
  2. Spray the sensor with MAF cleaner, ensuring not to touch the sensing element.
  3. Allow the sensor to dry completely before reinstalling.

4. Check and Replace Fuel Filter (if necessary)

• Tools Required: Socket set, fuel line disconnect tool
• Sub-steps:
  1. Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  2. Disconnect the fuel lines from the filter using the fuel line disconnect tool.
  3. Remove the old filter and install the new one, ensuring correct flow direction.

5. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench
• Sub-steps:
  1. Locate the upstream oxygen sensor on bank 2.
  2. Disconnect the wiring harness and remove the sensor using the O2 sensor socket.
  3. Install the new oxygen sensor and reconnect the wiring harness.

6. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0174 code.
  3. Perform a test drive to monitor engine performance and ensure the check engine light does not return.