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. 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 level surface and the parking brake is engaged.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air filter for cleanliness; replace if dirty.
  2. Check all intake hoses for cracks or loose connections; replace any damaged components.
  3. Inspect the intake manifold gasket for leaks; replace if necessary.
• Tools Required: Socket set, screwdrivers, vacuum gauge.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor on the air intake duct.
  2. Disconnect the electrical connector and unscrew the sensor.
  3. Use MAF cleaner to clean the sensor; allow it to dry completely before reinstallation.
  4. If the sensor is damaged, replace it with a new one.
• Tools Required: Torx screwdriver, MAF cleaner.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position without starting the engine to check the pressure reading.
  3. Compare the reading with manufacturer specifications; if low, inspect the fuel pump and filter.
• Tools Required: Fuel pressure gauge.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel rail and remove the injectors.
  2. Check for any visible signs of fuel leakage around the injectors.
  3. Use a multimeter to test injector resistance; replace any faulty injectors.
• Tools Required: Multimeter, socket set.