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

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, MAF sensor cleaner, socket set.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Inspect Air Filter:
  • Remove the air filter cover.
  • Check the air filter for clogs or dirt. Replace the air filter if necessary.
• Inspect Intake Hoses:
  • Visually inspect all hoses for cracks or disconnections.
  • Replace any damaged hoses.

3. Clean MAF Sensor

• Remove MAF Sensor:
  • Detach the electrical connector carefully.
  • Unscrew the MAF sensor from the intake duct.
• Clean the Sensor:
  • Use MAF sensor cleaner to spray the sensor element. Avoid touching it with fingers.
  • Allow it to dry completely before reinstalling.

4. Check Fuel Pressure

• Connect Fuel Pressure Gauge:
  • Locate the fuel rail and connect the gauge according to the manufacturer's specifications.
• Test Fuel Pressure:
  • Turn the ignition to the "on" position without starting the engine and check the pressure reading.
  • Compare the reading with manufacturer specifications. Replace the fuel pump if the pressure is low.

5. Inspect Vacuum Lines

• Visual Inspection:
  • Check all vacuum hoses connected to the engine for cracks or leaks.
• Replace Damaged Lines:
  • Cut and replace any damaged or worn hoses with new ones, ensuring a tight fit.

6. Test and Replace Fuel Injectors (if necessary)

• Remove Fuel Injectors:
  • Release fuel system pressure using the service manual instructions.
  • Disconnect electrical connectors and remove the injectors.
• Test Injectors:
  • Use a multimeter to check for resistance and verify proper operation.
• Replace Clogged Injectors:
  • If any injectors are faulty, replace them with new OEM parts.