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

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

Solution

1. Preparation

• Tools Required: OBD-II scanner, basic hand tools, vacuum gauge, MAF sensor cleaner.
• Safety Warnings: Ensure the vehicle is parked on a level surface and turned off before starting any repairs. Disconnect the battery to avoid electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or signs of wear.
  2. Remove and inspect the intake manifold gaskets; replace if damaged.
  3. Tighten all clamps and connections to ensure a proper seal.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct.
  3. Clean the MAF sensor with MAF cleaner and allow it to dry before reinstalling.
  4. Reconnect the MAF sensor and ensure it is properly seated.

4. Inspect Fuel Delivery System

• Sub-steps:
  1. Check fuel pressure with a fuel pressure gauge; compare readings to factory specifications.
  2. Replace the fuel filter if pressure is low or if it has not been changed in accordance with maintenance schedule.
  3. Inspect fuel lines for leaks or clogs.

5. Inspect Vacuum Lines

• Sub-steps:
  1. Visually check all vacuum lines for cracks or disconnections.
  2. Use a vacuum gauge to test the vacuum levels; replace any faulty lines.
  3. Ensure all connections are tight and secure.