how to fix the P0171 code on my 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 required tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine to detect leaks in the intake system.
  3. Replace any damaged hoses or gaskets with OEM parts.

3. Check and Replace Fuel Filter (if necessary)

• Sub-steps:
  1. Locate the fuel filter in the fuel line.
  2. Depressurize the fuel system by opening the fuel cap and using a fuel pressure gauge.
  3. Disconnect the fuel lines and remove the old filter.
  4. Install the new fuel filter, ensuring proper orientation and secure connections.

4. Clean or Replace the MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the intake duct.
  3. Clean the sensor using MAF cleaner spray, avoiding contact with the sensor element.
  4. If necessary, replace the MAF sensor with a new one.

5. Check and Replace Oxygen Sensors (if faulty)

• Sub-steps:
  1. Locate the upstream oxygen sensor(s) near the exhaust manifold.
  2. Use an oxygen sensor socket to remove the old sensor.
  3. Install the new oxygen sensor, ensuring it is properly torqued according to specifications.

6. Reconnect Battery and Clear Codes

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