how to fix the P0171 code on my Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0171 fuel system issue in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts necessary for repair.
• Disconnect the negative battery terminal to ensure safety.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Multimeter
• Socket set
• Screwdrivers
• Smoke machine (optional)

2. Inspect and Repair Air Intake System

• 2.1 Visually inspect all intake hoses, clamps, and connections for any signs of wear or damage.
• 2.2 If any leaks are found, replace the damaged hoses or tighten loose clamps as necessary.

3. Check and Replace Fuel Filter (if necessary)

• 3.1 Locate the fuel filter in the fuel line.
• 3.2 Use the socket set to disconnect the fuel lines from the filter.
• 3.3 Replace the old filter with a new one, ensuring correct orientation.
• 3.4 Reconnect the fuel lines securely.

4. Test and Clean MAF Sensor

• 4.1 Disconnect the MAF sensor electrical connector.
• 4.2 Remove the MAF sensor from the air intake duct using the appropriate socket.
• 4.3 Clean the MAF sensor with a specialized MAF cleaner and allow it to dry.
• 4.4 Reinstall the MAF sensor and reconnect the electrical connector.

5. Inspect and Replace Fuel Injectors (if needed)

• 5.1 Remove the engine cover to access the fuel rail and injectors.
• 5.2 Disconnect the fuel lines and electrical connectors from the injectors.
• 5.3 Remove the fuel injectors from the fuel rail.
• 5.4 Inspect for clogs; clean or replace injectors as necessary.
• 5.5 Reinstall the injectors and reconnect everything securely.