how to fix P0171 code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0171 engine lean condition in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is on a flat surface and the parking brake is engaged.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or looseness.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. Check the air filter; replace if dirty or clogged.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor using MAF cleaner; do not touch the sensor element.
  4. If cleaning does not resolve issues, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Sub-steps:
  1. Use a fuel pressure gauge to check the fuel pressure at the rail; compare against manufacturer specifications.
  2. If pressure is low, inspect the fuel pump wiring and connections.
  3. Replace the fuel pump if it is not functioning properly.
  4. Replace the fuel filter if it has not been changed recently.

5. Clear Codes and Recheck

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0171 code.
  3. Start the vehicle and check for any reoccurrences of the code.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Socket set
• Screwdriver set
• MAF cleaner

Parts Required:

• Air filter (if needed)
• MAF sensor (if needed)
• Fuel pump (if needed)
• Fuel filter (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before inspecting the air intake and fuel system components.