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

Learn how to diagnose and fix P0171 lean code in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake Components

• Tools Required: Flathead screwdriver, Torx bit set
• Remove the engine cover (if applicable) to access the intake system.
• Inspect the air filter and replace it if dirty.
• Check the intake duct for cracks or loose connections and replace any damaged components.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx bit set
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the intake duct.
• Clean the sensor with MAF cleaner and let it dry, or replace it if damaged.

4. Check and Adjust Fuel Delivery

• Tools Required: Fuel pressure gauge, line wrenches
• Connect the fuel pressure gauge to the fuel rail.
• Start the vehicle and monitor the fuel pressure; it should meet manufacturer specifications (typically around 43-60 psi).
• If pressure is low, inspect the fuel pump and fuel filter for blockages or failure.

5. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, torque wrench
• Locate the upstream oxygen sensor(s) in the exhaust system.
• Disconnect the sensor connector and remove it using the O2 sensor socket.
• Install the new sensor and torque it to the manufacturer’s specifications (usually around 30 lb-ft).
• Reconnect the sensor connector.