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 terminal of the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all intake hoses and clamps for signs of wear or damage.
  2. Tighten any loose clamps and replace damaged hoses.
  3. If any leaks are found, replace the affected component.
• Tools Required: Socket set, pliers, flashlight

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 using the appropriate socket size.
  4. Clean the MAF sensor with MAF cleaner or replace it if damaged.
  5. Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: Torx screwdriver, MAF cleaner, socket set

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the ON position (do not start the engine) and record the fuel pressure reading.
  3. If the pressure is below specifications, inspect the fuel pump and fuel filter for issues; replace as necessary.
  4. If the pressure is correct, proceed to check the fuel injectors for proper operation.
• Tools Required: Fuel pressure gauge

5. Inspect Oxygen Sensors

• Sub-steps:
  1. Locate the upstream oxygen sensor (usually near the exhaust manifold).
  2. Inspect the wiring and connector for damage.
  3. Test the sensor using a multimeter to check for proper voltage and response.
  4. Replace the oxygen sensor if it's not functioning correctly.
• Tools Required: Multimeter, socket set