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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect the air intake ducts for any cracks or loose connections.
  • Check vacuum hoses for damage and replace any that are cracked or broken.
  • If leaks are found, replace the damaged components and ensure all connections are tight.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake system.
  • Disconnect the electrical connector and remove the MAF sensor.
  • Clean the sensor with MAF cleaner spray. Allow it to dry completely before reinstalling.
  • If the sensor is damaged or heavily contaminated, replace it with a new one.

4. Inspect Fuel Delivery System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start) and check the fuel pressure reading.
  • If the pressure is below specifications, check the fuel pump operation and replace if necessary.
  • Inspect fuel filters for clogs and replace them as needed.

5. Replace or Test ECT Sensor

• Sub-steps:
  • Locate the ECT sensor, typically found near the thermostat housing.
  • Disconnect the electrical connector and remove the sensor.
  • Test the sensor using a multimeter for resistance values according to specifications.
  • If it is out of specification, replace the ECT sensor.