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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

Tools Required:

• OBD-II scanner
• Vacuum gauge
• Fuel pressure gauge
• Torque wrench
• Socket set
• Cleaning supplies (MAF cleaner, rags)

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all intake hoses and connections for cracks or loose fittings.
  2. Replace any damaged hoses or connections.
  3. Use a vacuum gauge to check for any vacuum leaks.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake duct.
  2. Clean the sensor with appropriate MAF cleaner and let it dry completely.
  3. If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail to check fuel pressure.
  2. If pressure is low, inspect the fuel pump and fuel filter for issues.
  3. Clean or replace the fuel injectors if they are clogged.

5. Replace ECT Sensor (if necessary)

• Sub-steps:
  1. Locate the ECT sensor on the engine block.
  2. Disconnect the electrical connector.
  3. Unscrew the sensor using the appropriate socket and replace it with a new one.
  4. Reconnect the electrical connector.