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 necessary tools and parts.
• Ensure the vehicle is in a safe, well-ventilated area.
• Disconnect the battery to prevent electrical hazards.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually check all vacuum hoses and connections for cracks or disconnections.
  • Use a smoke machine or carburetor cleaner to detect leaks in the intake manifold and associated components.
  • Replace any damaged hoses or gaskets found during inspection.
• Tools Required: Smoke machine, carburetor cleaner, hose clamp pliers.

3. MAF Sensor Cleaning or Replacement

• Sub-steps:
  • Locate the MAF sensor in the intake system.
  • Disconnect the electrical connector and unscrew the MAF sensor from its housing.
  • Clean the sensor using MAF cleaner spray and a soft cloth; allow it to dry completely.
  • Reinstall the MAF sensor or replace it if cleaning does not resolve the issue.
• Tools Required: Screwdriver set, MAF cleaner.
• Safety Warnings: Avoid touching the sensor element to prevent damage.

4. Fuel Pressure Check

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail service port.
  • Turn the ignition to the "ON" position (do not start the engine) and check the pressure readings.
  • Compare the readings to manufacturer specifications; replace the fuel pump if pressure is inadequate.
• Tools Required: Fuel pressure gauge.
• Safety Warnings: Relieve fuel pressure before disconnecting any lines.

5. Fuel Injector Inspection and Cleaning

• Sub-steps:
  • Remove the fuel rail to access the injectors.
  • Inspect each injector for leaks or clogs.
  • Use a fuel injector cleaning kit to clean the injectors or replace them if necessary.
• Tools Required: Fuel injector cleaning kit, socket set.