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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to detect leaks around the intake manifold and throttle body.
  3. Replace any damaged vacuum hoses or gaskets.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor from the duct.
  3. Clean the MAF sensor using MAF cleaner spray (do not touch the sensor elements).
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the "ON" position (do not start) and observe the fuel pressure reading.
  3. Compare the reading to the manufacturer’s specifications (typically around 43-50 psi for the Camry).
  4. If the pressure is low, check the fuel pump and fuel filter for issues. Replace as necessary.

5. Inspect and Test Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors on Bank 2.
  2. Check wiring and connectors for damage or corrosion.
  3. Use a multimeter to test the sensor’s voltage output while the engine is running.
  4. Replace any malfunctioning oxygen sensors.

6. Verify Fuel Injector Operation

• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Inspect each injector for clogs or leaks.
  3. Clean the injectors using an ultrasonic cleaner or replace them if necessary.
  4. Reinstall the fuel rail and ensure all connections are secure.