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

Learn how to diagnose and fix P0171 lean code 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 ignition is off.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Inspect the air intake duct for any signs of damage or disconnection.
  3. Tighten any loose clamps or replace damaged hoses.
  4. Replace any damaged air intake components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, torque wrench
• Sub-steps:
  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the intake tube.
  3. Clean the MAF sensor using MAF cleaner, following the manufacturer's instructions.
  4. If damaged, replace the MAF sensor with a new one.
  5. Reinstall the MAF sensor and reconnect the wiring harness.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, diagnostic multimeter
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the ON position without starting the engine to check for proper fuel pressure.
  3. If pressure is low, check the fuel pump operation and replace if necessary.
  4. Inspect the fuel filter and replace if clogged.

5. Inspect and Replace Vacuum Hoses

• Tools Required: Visual inspection tools
• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or leaks.
  2. Replace any damaged hoses with new ones.
  3. Ensure all connections are tight and secure.