how to fix P0171 code in 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 necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Vacuum Hoses

• Tools Needed: Pliers, flashlight.
• Inspect all vacuum hoses connected to the intake manifold.
• Look for cracks or loose connections.
• Replace any damaged hoses with new ones.

3. Clean the MAF Sensor

• Tools Needed: MAF cleaner, soft cloth.
• Locate the MAF sensor on the intake duct.
• Carefully disconnect the electrical connector.
• Remove the MAF sensor from the duct.
• Spray the MAF cleaner onto the sensor element and let it dry completely before reinstalling.

4. Check Fuel Pressure

• Tools Needed: Fuel pressure gauge.
• Locate the fuel rail and attach the fuel pressure gauge.
• Turn the ignition to the "ON" position without starting the engine.
• Verify the fuel pressure against manufacturer specifications (usually around 50-60 psi for most electric fuel pumps).
• If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Throttle Body

• Tools Needed: Throttle body cleaner, socket set.
• Remove the air intake duct to access the throttle body.
• Inspect for carbon buildup and clean it using throttle body cleaner and a soft cloth.
• Reinstall the air intake duct securely.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code and any other related codes.