how to fix P0174 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0174 engine lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety.
• Allow the engine to cool before proceeding.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the intake system.
  2. Visually inspect intake hoses and gaskets for cracks or loose connections.
  3. Replace any damaged hoses or gaskets.
  4. Reconnect everything securely and replace the engine cover.

3. Check and Clean Mass Airflow Sensor

• Tools Required: MAF cleaner
• Sub-steps:
  1. Locate the mass airflow sensor in the intake system.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from its housing using the appropriate socket.
  4. Clean the sensor with MAF cleaner, ensuring not to touch the sensor elements.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect Fuel Delivery System

• Sub-steps:
  1. Check the fuel pump for proper operation by listening for its sound when the ignition is turned on.
  2. Test the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
  3. Remove and inspect fuel injectors for clogs or leaks; clean or replace as necessary.

5. Address Vacuum Leaks

• Sub-steps:
  1. Locate the vacuum lines and inspect them for any cracks or disconnections.
  2. Replace any damaged vacuum lines.
  3. Use a smoke machine if necessary to identify hard-to-find leaks.