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

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

Solution

1. Preparation

• Gather the necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Repair Air Intake System

• Inspect Components: Check all hoses and connections in the air intake system for cracks or leaks. Replace any damaged hoses.
• Tools Required: Socket set, screwdriver set.
• Safety Warning: Ensure the engine is off and cool before inspecting.

3. Clean or Replace the MAF Sensor

• Remove MAF Sensor: Disconnect the electrical connector and unscrew the MAF sensor from the air intake.
• Clean the Sensor: Use MAF sensor cleaner to spray the sensor and allow it to dry completely. If damaged, replace it.
• Reinstall: Secure the MAF sensor back in place and reconnect the electrical connector.

4. Check Fuel Pressure

• Connect Fuel Pressure Gauge: Locate the fuel rail and connect the gauge to the test port.
• Measure Pressure: Turn the ignition to the "ON" position (do not start the engine) and read the fuel pressure. It should match the specifications in the service manual.
• Replace Fuel Pump: If pressure is low, replace the fuel pump and filter as needed.

5. Inspect Fuel Injectors

• Remove Fuel Rail: Disconnect the fuel rail and remove the injectors.
• Clean or Replace: Clean injectors using a specialized injector cleaner or replace them if they are defective.
• Reinstall: Reattach the fuel rail and ensure all connections are secure.

6. Clear Codes and Test

• Reconnect Battery: Reconnect the negative battery terminal.
• Clear Codes: Use an OBD-II scanner to clear the P0171 code.
• Test Drive: Take the vehicle for a test drive to ensure the issue is resolved and the check engine light does not reappear.