how to fix the P0171 code on my Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0171 engine lean condition in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, basic hand tools, multimeter, vacuum gauge, cleaning supplies.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical short circuits.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses and clamps for cracks or loose connections.
  2. Tighten or replace any damaged hoses or clamps.
  3. If the MAF sensor is dirty, clean it with MAF sensor cleaner and allow it to dry completely before reinstallation.

3. Check Fuel System

• Sub-steps:
  1. Use a fuel pressure gauge to check the fuel pressure at the fuel rail. Compare the reading to the manufacturer specifications.
  2. If the pressure is low, inspect the fuel pump and filter for clogs or failures.
  3. If injectors are suspected, perform a resistance test with a multimeter to ensure they are within specifications.

4. Inspect Vacuum Lines

• Sub-steps:
  1. Visually inspect all vacuum lines for wear, cracks, or looseness.
  2. Replace any damaged vacuum lines.
  3. Use a vacuum gauge to check for leaks in the system.

5. Reconnect Components and Clear Codes

• Sub-steps:
  1. Reconnect the battery and MAF sensor connector.
  2. Clear the P0171 code using the OBD-II scanner.
  3. Start the engine and allow it to reach operating temperature.