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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, vacuum gauge, MAF sensor cleaner.
• Inspect all intake hoses for cracks or loose connections.
• Tighten or replace any loose or damaged hoses.
• Clean the MAF sensor using MAF cleaner to ensure accurate readings.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on without starting the engine and check the fuel pressure.
• If pressure is below specifications, check the fuel pump and filter for blockage or failure.
• Replace the fuel filter if necessary.

4. Check Engine Coolant Temperature (ECT) Sensor

• Tools Required: Multimeter.
• Locate the ECT sensor and disconnect the electrical connector.
• Use a multimeter to measure the resistance of the sensor at various temperatures and compare with manufacturer specifications.
• Replace the ECT sensor if readings are out of range.

5. Clear Codes and Test Drive

• After repairs are made, reconnect the battery.
• Clear any codes using the OBD-II scanner.
• Start the engine and allow it to reach operating temperature.
• Test drive the vehicle to ensure the issue is resolved.