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 equipment: OBD-II scanner, fuel pressure gauge, MAF cleaner, multimeter, basic hand tools (socket set, screwdrivers), and safety gear (gloves, goggles).
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Step 1: Visually inspect hoses and connections for wear or damage.
  • Tools Required: None
• Step 2: Replace any damaged hoses or clamps.
  • Parts Required: Replacement hoses or clamps as necessary.
• Step 3: Reconnect all components properly.

3. Check and Clean MAF Sensor

• Step 1: Locate the MAF sensor in the air intake system.
  • Tools Required: Basic hand tools
• Step 2: Remove the MAF sensor carefully, avoiding damage to the connector.
• Step 3: Clean the MAF sensor using MAF cleaner and allow it to dry.
• Step 4: Reinstall the MAF sensor and ensure it is securely connected.

4. Check Fuel Pressure

• Step 1: Connect the fuel pressure gauge to the fuel rail.
  • Tools Required: Fuel pressure gauge
• Step 2: Start the engine and check the pressure; refer to the manufacturer’s specifications for the correct value.
• Step 3: If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Oxygen Sensors

• Step 1: Locate the upstream and downstream oxygen sensors.
  • Tools Required: Socket set
• Step 2: Check the wiring and connectors for damage.
• Step 3: Test the sensors using a multimeter for proper voltage output.
• Step 4: Replace any faulty sensors.