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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, vacuum gauge, fuel pressure gauge, socket set, torque wrench, cleaning supplies (mass air flow cleaner).
• Ensure the vehicle is parked on a level surface and the engine is cool before starting repairs.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all hoses connected to the intake manifold for cracks or disconnections.
  2. Use a vacuum gauge to check for leaks: connect it to a vacuum port and observe if the gauge reads low.
  3. If leaks are found, replace damaged hoses or reseal connections.
  4. Recheck for leaks using a smoke machine if available.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Clean the sensor using a specialized MAF cleaner; avoid touching the sensor with tools.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Repair Fuel System

• Sub-steps:
  1. Use a fuel pressure gauge to check the fuel pressure at the rail; compare it with manufacturer specifications.
  2. If pressure is low, inspect the fuel pump and filter for blockages or failures.
  3. Replace the fuel filter if necessary and consider replacing the fuel pump if pressure issues persist.
  4. Ensure the fuel injectors are functioning correctly; consider cleaning them or replacing if faulty.

5. Inspect and Replace O2 Sensors (if needed)

• Sub-steps:
  1. Check the upstream and downstream O2 sensors' operation using a multimeter.
  2. If the sensors are not providing correct readings, replace them with new ones.
  3. Clear the P0174 code using the OBD-II scanner after repairs.