how to fix the P0171 code on my Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0171 engine lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or signs of wear.
  2. Tighten or replace any loose or damaged hoses.
  3. Use a smoke machine to detect any hidden air leaks if necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from the housing.
  4. Use MAF sensor cleaner to clean the sensor carefully.
  5. Allow the sensor to dry and reinstall it.

4. Check and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (without starting the engine) to check fuel pressure.
  3. If pressure is below specifications, replace the fuel pump or repair any fuel line leaks.
  4. Inspect and clean the fuel injectors using a fuel injector cleaning kit.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Start the engine and spray a small amount of carburetor cleaner around the intake manifold and vacuum hoses.
  2. If the engine idle changes, identify and replace the affected vacuum hose or gasket.