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

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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, vacuum gauge, basic hand tools.
• Clear any existing codes from the ECM using the OBD-II scanner after completing diagnostics.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and connections for cracks or loose fittings.
  2. Tighten any loose clamps and replace damaged hoses.
  3. If a leak is found, replace the affected components using OEM parts to ensure proper fitment.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake tube.
  3. Clean the MAF sensor gently using MAF cleaner spray. Avoid touching the sensor elements.
  4. Reinstall the MAF sensor and reconnect the electrical connector. If the sensor is faulty, replace it with a new one.

4. Inspect Fuel System

• Sub-steps:
  1. Check fuel pressure using a fuel pressure gauge. It should meet specifications for the Tesla Model S.
  2. If pressure is low, inspect the fuel pump and filter for clogs or failures.
  3. Ensure all fuel injectors are functioning properly; clean or replace as necessary.

5. Check Exhaust System

• Sub-steps:
  1. Inspect the exhaust manifold and pipes for leaks.
  2. Repair or replace any components that are leaking to ensure proper exhaust flow.

6. Test Oxygen Sensors

• Sub-steps:
  1. Use a multimeter to test the voltage output of the upstream oxygen sensor.
  2. If the readings are outside the manufacturer’s specifications, replace the sensor.