how to resolve the P0171 code in my Tesla Model S Original (2012-2020)

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks, splits, or disconnection.
  • Use an intake air leak detection method (e.g., smoke test) to identify leaks.
  • Replace any damaged hoses and reseal gaskets as needed.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the intake system.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor with MAF cleaner spray and allow it to dry completely.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
  • Ensure that the pressure matches the specifications for your vehicle (usually around 40-60 psi).
  • If pressure is low, inspect the fuel pump and fuel filter, replacing them if necessary.

5. Inspect Oxygen and Fuel Trim Sensors

• Sub-steps:
  • Locate the upstream oxygen sensor and check its condition.
  • Use a multimeter or scan tool to check the sensor's output voltage while the engine is running.
  • Replace the oxygen sensor if it shows no activity or incorrect readings.

6. Reassemble and Clear Codes

• Sub-steps:
  • Reconnect any components that were removed during the process.
  • Reconnect the negative terminal of the battery.
  • Use an OBD-II scanner to clear the P0171 code from the ECM.