how to fix P0174 code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:

  • Visually inspect all air intake hoses for cracks or disconnections.
  • If any cracks are found, replace the affected hoses.
  • Check the intake manifold gasket for leaks; replace if necessary.

• Tools Required:

  • Socket set
  • Torque wrench

3. Clean or Replace MAF Sensor

• Sub-steps:

  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor with MAF cleaner spray. Allow it to dry completely before reinstalling.
  • If cleaning does not resolve issues, replace the sensor with a new one.

• Tools Required:

  • Screwdriver set
  • MAF cleaner spray

4. Inspect Fuel System

• Sub-steps:

  • Use a fuel pressure gauge to check fuel pressure at the fuel rail.
  • If pressure is low, inspect the fuel pump and fuel filter; replace as necessary.
  • Check fuel injectors for clogs or leaks; clean or replace injectors if required.

• Tools Required:

  • Fuel pressure gauge
  • Injector cleaning kit

5. Check Oxygen Sensors

• Sub-steps:

  • Locate the upstream and downstream oxygen sensors.
  • Use a multimeter to test the voltage output of each sensor.
  • Replace any faulty oxygen sensors with new ones.

• Tools Required:

  • Multimeter
  • Oxygen sensor socket

6. Verify ECT Sensor Functionality

• Sub-steps:

  • Remove the ECT sensor and test it with a multimeter to ensure it provides correct resistance readings.
  • If faulty, replace the ECT sensor and reconnect wiring.

• Tools Required:

  • Multimeter
  • Socket set