how to fix 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 vehicle's 12V battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure it with jack stands if necessary.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Multimeter
• Socket set
• Torque wrench
• MAF cleaner or replacement part

2. Inspect and Repair Air Intake System

• Step 1: Visually inspect the air intake hoses for cracks or loose connections.
• Step 2: Tighten any loose clamps or replace damaged hoses.
• Step 3: If a leak is found, replace the affected component and ensure all connections are secure.

3. Check and Clean MAF Sensor

• Step 1: Locate the MAF sensor, typically found between the air filter and the throttle body.
• Step 2: Disconnect the electrical connector from the MAF sensor.
• Step 3: Remove the MAF sensor using the appropriate socket.
• Step 4: Clean the MAF sensor with MAF cleaner, ensuring not to touch the sensor element.
• Step 5: Reinstall the MAF sensor and reconnect the electrical connector.

4. Verify Fuel System Pressure

• Step 1: Connect the fuel pressure gauge to the fuel rail service port.
• Step 2: Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading against manufacturer specifications.
• Step 3: If the pressure is low, inspect the fuel pump, fuel filter, and fuel injectors for proper operation and replace any faulty components.

5. Clear Codes and Test Drive

• Step 1: Reconnect the vehicle's battery.
• Step 2: Use the OBD-II scanner to clear the P0171 code.
• Step 3: Start the engine and allow it to reach operating temperature.
• Step 4: Test drive the vehicle to ensure the engine operates smoothly and the check engine light does not reappear.