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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to avoid electrical shorts.
• Allow the engine to cool down before working.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or carb cleaner to detect leaks; listen for hissing sounds.
  3. Replace any damaged hoses or gaskets.
• Tools Required: Vacuum gauge, smoke machine (optional), or carb cleaner.

3. Clean MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Spray MAF sensor cleaner onto the sensing elements; do not touch them with any tools.
  4. Allow the sensor to dry completely before reinstalling.
• Tools Required: MAF sensor cleaner.

4. Check and Clean Throttle Body

• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding areas.
  3. Inspect the throttle body gasket and replace if necessary.
• Tools Required: Throttle body cleaner, soft cloth.

5. Test and Replace Fuel Pressure Regulator (if necessary)

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "On" position (do not start) and check the pressure; it should meet manufacturer specifications.
  3. If pressure is low, replace the fuel pressure regulator.
• Tools Required: Fuel pressure gauge.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals securely.
  2. Use an OBD-II scanner to clear the P0174 code and any other stored codes.
• Tools Required: OBD-II scanner.