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

Learn how to diagnose and fix P0171 engine too lean condition in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before working on it.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Inspect all air intake hoses for cracks or loose connections.
  3. Replace any damaged hoses with OEM parts.
  4. Reconnect all hoses securely.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from its housing.
  4. Clean the sensor with MAF cleaner or replace it if damaged.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Delivery System

• Sub-steps:
  1. Use a fuel pressure gauge to check the fuel pressure at the fuel rail.
  2. If fuel pressure is low, check the fuel pump and relay for functionality.
  3. Replace the fuel filter if it is clogged.
  4. Inspect and clean the fuel injectors as necessary.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Conduct a visual inspection of all vacuum hoses and connections.
  2. Use a smoke machine or carburetor cleaner to detect leaks.
  3. Repair or replace any leaking vacuum hoses.

Tools Required:

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

Parts Required:

• Replacement air intake hoses (if damaged)
• MAF sensor (if needed)
• Fuel filter (if clogged)
• Fuel injectors (if faulty)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow engine to cool before opening any components to avoid burns.