how to fix a P0174 code on Toyota Camry Eighth Generation (2018-present)?

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to locate leaks by spraying around suspect areas while the engine is running.
  3. Replace any damaged hoses or components as necessary.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the sensor from the air intake duct (usually held by screws or clips).
  3. Clean the sensor with MAF cleaner spray, following the product instructions.
  4. Allow the sensor to dry completely, then reinstall it and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (without starting the engine) and check the pressure reading against the manufacturer specifications.
  3. If pressure is low, inspect the fuel pump, fuel filter, and fuel injectors for issues.
  4. Replace any faulty components as needed.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. Remove the fuel injector rail from the engine (ensure fuel pressure is relieved first).
  2. Examine each injector for clogs or leaks.
  3. Clean injectors using a professional injector cleaning kit or replace if heavily clogged.