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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

2. Inspect and Repair Air Intake System

• Inspect Air Filter: Remove the air filter and check for dirt or blockages. Replace if necessary.
• Check for Leaks: Inspect the air intake ducts and connections for any signs of wear or damage. Replace any damaged hoses or fittings.

3. Clean the Mass Air Flow (MAF) Sensor

• Remove MAF Sensor: Disconnect the electrical connector and unscrew the MAF sensor from the air intake duct.
• Clean Sensor: Use MAF cleaner to spray the sensor elements. Allow it to dry completely before reinstallation.

4. Check Fuel Pressure

• Connect Fuel Pressure Gauge: Locate the fuel rail and attach the gauge.
• Measure Pressure: Turn the ignition on (do not start the engine) and check the pressure reading against specifications. A typical range should be 43-55 psi for many systems.
• Adjust or Replace Fuel Pump: If pressure is low, consider replacing the fuel pump or checking the fuel filter.

5. Inspect Vacuum Hoses

• Visual Inspection: Check all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Replace Hoses: Replace any damaged hoses with OEM parts to prevent air leaks.

6. Reassemble and Test

• Reconnect MAF Sensor: Ensure the sensor is securely fastened and the connector is firmly attached.
• Reconnect Battery: Reattach the negative battery terminal.
• Clear Codes: Use the OBD-II scanner to clear the P0171 code from the system.