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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to avoid electrical issues during repairs.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, flashlight
• Sub-steps:
  1. Visually inspect all vacuum hoses and the intake manifold for cracks or loose connections.
  2. Use a vacuum gauge to test for leaks at the intake manifold.
  3. Replace any damaged hoses or gaskets as necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the intake system.
  2. Disconnect the wiring harness and remove the sensor using a screwdriver.
  3. Clean the MAF sensor using MAF cleaner, ensuring not to touch the sensing element.
  4. Reinstall the MAF sensor and reconnect the wiring harness.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition key to the "On" position without starting the engine to pressurize the system.
  3. Check the fuel pressure reading against manufacturer specifications.
  4. If pressure is low, inspect the fuel pump and fuel filter for issues.

5. Check Fuel Injectors

• Tools Required: Multimeter
• Sub-steps:
  1. Disconnect the fuel injector connectors.
  2. Use a multimeter to measure the resistance of each injector. It should match manufacturer specifications.
  3. Replace any injectors that do not meet specifications.

6. Reassemble and Reconnect Battery

• Reconnect the battery terminals securely.
• Start the vehicle and let it reach operating temperature.