how to fix P0171 code in 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 all necessary tools and parts.
• Disconnect the 12V battery to ensure safety during repairs.
• Allow the engine to cool completely before inspection.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Inspect all intake hoses and connections for cracks or leaks.
  • If any hoses are damaged, replace them with OEM parts.
• Use a vacuum gauge to verify the integrity of the intake system.
• Reassemble and ensure all connections are secure.

3. Check and Replace Fuel Filter

• Tools Required: Fuel line wrenches, container for fuel collection
• Locate the fuel filter and relieve the fuel pressure.
• Remove the fuel filter and inspect it for clogs or damage.
• Replace with a new filter if necessary, ensuring proper orientation.

4. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver
• Remove the MAF sensor from the air intake duct.
• Clean the sensor using MAF cleaner and allow it to dry completely.
• If the sensor is damaged, replace it with a new one.

5. Inspect and Test Fuel Injectors

• Tools Required: Fuel pressure gauge, injector cleaning kit
• Connect the fuel pressure gauge to the fuel rail and start the engine.
• Ensure that fuel pressure is within specifications (typically 43-50 psi).
• If pressure is low, test the fuel pump and replace if faulty.
• Use an injector cleaning kit to clean the injectors if they are clogged.

6. Reassemble and Reconnect Battery

• After completing repairs, reassemble any components removed during the process.
• Reconnect the 12V battery.