how to fix P0171 code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's 12V battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, torque wrench, vacuum gauge.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Inspect all hoses and connections in the air intake system for cracks or loose fittings.
  3. Use a vacuum gauge to test for vacuum leaks; repair any leaks found.
  4. Reassemble any components removed, ensuring all connections are secure.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the MAF sensor from the duct.
  3. Spray MAF cleaner onto the sensor element to remove dirt and debris.
  4. Allow the sensor to dry completely before reinstallation.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and attach the fuel pressure gauge.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure reading against manufacturer specifications.
  3. If the pressure is low, inspect the fuel pump, fuel filter, and related lines for blockages or failures.

5. Inspect Fuel Injectors

• Tools Required: Multimeter.
• Sub-steps:
  1. Disconnect the electrical connectors from the fuel injectors.
  2. Use a multimeter to measure the resistance of each injector. Compare readings to manufacturer specifications.
  3. Replace any faulty injectors as necessary.

6. Reconnect Battery and Clear Codes

• Reconnect the vehicle's 12V battery.
• Use an OBD-II scanner to clear the P0171 code and any other stored codes.