how to fix P0171 code on 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

• Gather tools and parts needed for repairs.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Check all air intake hoses and connections for cracks or leaks.
  • Tighten any loose clamps or replace damaged hoses.
  • If a vacuum leak is found, replace the damaged section.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner.
• Remove the MAF sensor from the air intake.
  • Spray the MAF sensor with MAF cleaner, ensuring not to touch the sensor element.
  • Allow it to dry completely before reinstalling.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Connect the fuel pressure gauge to the fuel rail and turn the ignition to the ON position without starting the engine.
  • Check the fuel pressure; it should match manufacturer specifications (typically around 58-62 psi).
  • If pressure is low, inspect the fuel pump and replace the fuel filter if needed.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit.
• Remove the fuel injectors and inspect for any clogs or damage.
  • Use an injector cleaning kit to clean the injectors if necessary.
  • Reinstall the injectors ensuring they are seated correctly.

6. Reassemble and Test

• Reconnect any components removed during the inspection.
• Reconnect the negative terminal of the battery.
• Start the engine and allow it to idle.