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

Learn how to diagnose and fix P0171 engine lean condition in Tesla Model S Plaid. 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.

2. Inspect and Repair Air Intake System

• Sub-step 1: Visually inspect air intake hoses for cracks or disconnections. Replace any damaged hoses.
• Sub-step 2: Check the air filter for cleanliness. Replace if dirty or clogged.
• Sub-step 3: Ensure the intake manifold is properly sealed and free from leaks.

3. Clean MAF Sensor

• Sub-step 1: Remove the MAF sensor from its housing.
• Sub-step 2: Use MAF cleaner to gently clean the sensor element. Avoid touching the sensor with fingers.
• Sub-step 3: Reinstall the MAF sensor securely.

4. Test and Replace Fuel Pump (if necessary)

• Sub-step 1: Connect a fuel pressure gauge to the fuel rail.
• Sub-step 2: Turn the ignition to the ON position without starting the engine to read the fuel pressure.
• Sub-step 3: Compare the reading with manufacturer specifications. If below spec, replace the fuel pump.

5. Clear Codes and Recheck

• Sub-step 1: Reconnect the battery.
• Sub-step 2: Use the OBD-II scanner to clear the P0171 code.
• Sub-step 3: Start the vehicle and monitor for any reoccurrence of the code.