how to fix P0171 code in Tesla Model S Original (2012-2020)

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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to ensure safety during repairs.
• Ensure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses and connections for cracks or disconnections.
  • Use a smoke machine or spray soapy water on suspected areas to detect leaks.
  • Replace any damaged hoses or gaskets as necessary.

3. Clean the Mass Air Flow (MAF) Sensor

• Tools Required: MAF cleaner spray
• Sub-steps:
  • Locate the MAF sensor in the intake duct.
  • Remove the MAF sensor from the duct carefully.
  • Spray the MAF cleaner onto the sensing elements and allow it to dry.
  • Reinstall the MAF sensor ensuring proper orientation and connection.

4. Check and Replace Fuel Filter

• Tools Required: Fuel line disconnect tool, socket set
• Sub-steps:
  • Locate the fuel filter in the fuel system.
  • Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
  • Disconnect the fuel lines using the fuel line disconnect tool.
  • Remove the old fuel filter and install the new one, ensuring correct flow direction.
  • Reconnect the fuel lines and fuse.

5. Inspect Fuel Injectors

• Tools Required: Fuel pressure gauge, injector cleaner (if needed)
• Sub-steps:
  • Use the fuel pressure gauge to check for proper fuel pressure.
  • If pressure is low, consider testing or replacing the fuel pump.
  • For clogged injectors, use an injector cleaning solution or replace the injectors if necessary.