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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to check for leaks around gaskets and joints.
  • Replace any damaged hoses or gaskets found during inspection.
• Tools Required: Smoke machine or carburetor cleaner, pliers.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Remove the connector and the mounting screws to take out the MAF sensor.
  • Clean the MAF sensor using MAF cleaner spray; do not touch the sensor elements.
  • If the sensor is damaged or cleaning does not help, replace it with a new one.
• Tools Required: Torx or screwdriver set, MAF cleaner spray.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading.
  • If the pressure is below specifications, inspect the fuel pump and fuel filter for issues.
  • Replace the fuel pump or filter if necessary.
• Tools Required: Fuel pressure gauge, wrench set.

5. Clear Codes and Test Drive

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Clear the stored error codes using the OBD-II scanner.
  • Start the engine and allow it to reach operating temperature.
  • Take the vehicle for a test drive to ensure the issue is resolved and the check engine light does not reappear.
• Tools Required: OBD-II scanner.