what causes the P0171 code in 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 the necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and connections for cracks, breaks, or loose fittings.
  2. Replace any damaged hoses or reconnect loose fittings.
  3. Ensure the air filter is clean and not obstructing airflow; replace if necessary.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor between the air filter and the intake manifold.
  2. Disconnect the electrical connector and remove the sensor from its housing.
  3. Spray the MAF sensor with cleaner and let it dry; do not touch the sensor elements.
  4. Reinstall the MAF sensor and reattach the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and attach the fuel pressure gauge to the test port.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure reading.
  3. Compare the reading to the manufacturer’s specifications; if low, inspect the fuel pump and filter.
  4. If necessary, replace the fuel pump or filter.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the upstream oxygen sensor (before the catalytic converter).
  2. Disconnect the electrical connector and test the sensor's voltage output with a multimeter.
  3. Compare the readings to manufacturer specifications; replace the sensor if readings are outside of the expected range.
  4. Reconnect the sensor and ensure all connections are secure.