how to fix P0171 code on Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely lifted if needed.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:

  1. Visually inspect vacuum lines for cracks or disconnections.
  2. Use a smoke machine to detect leaks in the intake system.
  3. Replace any damaged hoses or gaskets.

• Tools Required: Smoke machine, basic hand tools (screwdrivers, pliers).

3. Clean or Replace the MAF Sensor

• Sub-steps:

  1. Locate the MAF sensor on the intake manifold.
  2. Disconnect the electrical connector and remove the MAF sensor.
  3. Clean the sensor using MAF cleaner spray; do not touch the sensor element.
  4. Reinstall the sensor and reconnect the electrical connector.

• Tools Required: MAF cleaner spray, screwdrivers.

4. Test and Repair Fuel System

• Sub-steps:

  1. Connect a fuel pressure gauge to the fuel rail.
  2. Start the engine and observe the fuel pressure; it should match manufacturer specifications (typically around 50-60 psi).
  3. If pressure is low, check the fuel pump and fuel filter for issues; replace as necessary.

• Tools Required: Fuel pressure gauge, basic hand tools.

5. Inspect and Test Fuel Injectors

• Sub-steps:

  1. Remove the fuel injectors from the fuel rail.
  2. Check for clogs or leaks; perform a resistance test to confirm they are within specifications (typically 12-16 ohms).
  3. Replace any faulty injectors.

• Tools Required: Basic hand tools, multimeter.