how to fix P0174 lean code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0174 lean code in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the vehicle's battery to prevent any electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and connections for signs of wear or damage.
  2. Replace any damaged hoses with OEM parts.
  3. Ensure that the air filter is clean; replace if necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor using the appropriate socket.
  4. Clean the sensor with MAF cleaner or replace it if damaged.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure.
  3. If the pressure is low, inspect the fuel pump, relay, and fuel filter for issues; replace as necessary.
  4. Test the fuel injectors for proper operation using a multimeter and replace any faulty injectors.

5. Reprogram or Update ECU

• Sub-steps:
  1. Connect a diagnostic tool to the vehicle's OBD-II port.
  2. Check for any available software updates for the ECU.
  3. Follow the manufacturer's instructions to update or reprogram the ECU if needed.