how to clear P0171 code in Tesla Model S Plaid/Refresh (2021-present)

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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.

Tools Required:

• OBD-II scanner
• Torque wrench
• Screwdrivers (flathead and Phillips)
• Pliers
• Cleaning supplies (MAF cleaner)

2. Inspect and Repair Air Intake System

1. Inspect Air Intake Hoses

   • Check all hoses for cracks or disconnections.
   • Tighten any loose clamps or replace damaged hoses if necessary.

2. Check MAF Sensor

   • Disconnect the wiring harness from the MAF sensor.
   • Remove the MAF sensor using the appropriate screwdriver.
   • Clean the sensor with MAF cleaner and allow it to dry completely.
   • Reinstall the MAF sensor and reconnect the wiring harness.

3. Examine Fuel Delivery System

1. Check Fuel Pressure

   • Connect a fuel pressure gauge to the fuel rail.
   • Turn the ignition key to the "ON" position to prime the fuel system.
   • Compare the reading to manufacturer specifications; replace the fuel pump if pressure is low.

2. Inspect Fuel Filter

   • Locate and remove the fuel filter (if applicable).
   • Replace it with a new filter if it is clogged or has not been changed per maintenance schedule.

4. Vacuum Leak Inspection

1. Visual Inspection

   • Inspect all vacuum lines for damage or disconnections.
   • Replace any broken or cracked vacuum hoses.

2. Use Smoke Test (if necessary)

   • Introduce smoke into the intake system to visually identify any leaks.

5. Clear DTC

• Use the OBD-II scanner to clear the P0171 code from the ECM after making repairs.
• Ensure all systems are functioning correctly before completing the repair process.