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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, vacuum gauge
• Check all hoses and connections for leaks:
  • Remove the air intake duct and inspect for cracks or wear.
  • Replace any damaged hoses.
  • Reconnect the duct securely.
• Test for vacuum leaks:
  • Use a vacuum gauge to check for proper readings; replace any components that are leaking.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, soft cloth
• Remove the MAF sensor:
  • Disconnect the electrical connector.
  • Remove the screws holding the MAF sensor in place.
• Clean the sensor:
  • Spray MAF cleaner on the sensor element without touching it.
  • Let it dry completely before reinstalling.
• Reinstall the MAF sensor securely and reconnect the electrical connector.

4. Check Fuel Delivery System

• Tools Required: Fuel pressure gauge, wrench set
• Check fuel pressure:
  • Locate the fuel rail and connect the pressure gauge.
  • Turn the ignition to the ON position (do not start) and check the pressure; it should match factory specifications.
• If pressure is low:
  • Inspect the fuel pump and filter for clogs or failure and replace as necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit (if needed)
• Remove the fuel injectors:
  • Disconnect the electrical connectors and fuel lines (use caution as fuel may spill).
  • Remove the injector retaining clips and extract the injectors.
• Clean or replace injectors:
  • Use an injector cleaning kit to clean; if cleaning does not resolve the issue, replace injectors with new ones.
• Reinstall injectors, ensuring proper sealing and securing of clips.

6. Verify O2 Sensor Operation

• Tools Required: Multimeter
• Test the O2 sensors:
  • Using a multimeter, measure the voltage output of the O2 sensors while the engine is running.
  • If readings are outside the normal range (0.1 to 0.9 volts for switching sensors), replace the faulty O2 sensor.