how to fix P0174 code in Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight
• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or disconnections.
  2. Tighten or replace any loose or damaged hoses.
  3. Check the intake manifold gasket for leaks and replace if necessary.
  4. If any leaks are found, seal or replace the affected components.

3. Check Fuel Delivery System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position (do not start) and check the fuel pressure; it should meet manufacturer's specifications (typically around 40-50 psi).
  3. If the pressure is low, inspect the fuel pump and replace if defective.
  4. Replace the fuel filter if it is clogged or hasn’t been replaced as per the maintenance schedule.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner or isopropyl alcohol, Torx screwdriver
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the intake manifold.
  3. Use MAF sensor cleaner to gently clean the sensor element; avoid touching it with any tools.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket
• Sub-steps:
  1. Locate and remove the oxygen sensors from the exhaust system.
  2. Inspect the sensors for any signs of damage or contamination.
  3. Replace any faulty oxygen sensors with OEM or equivalent parts.
  4. Reinstall the sensors and ensure they are properly connected.

6. Verify ECT Sensor Operation

• Tools Required: Multimeter
• Sub-steps:
  1. Disconnect the ECT sensor connector.
  2. Measure the resistance of the sensor at various temperatures (consult service manual for specifications).
  3. Replace the ECT sensor if the readings are outside specified ranges.
  4. Reconnect the sensor.