how to fix Tesla Model S Plaid with a P0171 error code

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 tools and materials: OBD-II scanner, fuel pressure gauge, MAF cleaner, socket set, and torque wrench.
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Inspect and Repair Air Intake System

• 1.1: Visually inspect all air intake hoses and connections for cracks or disconnections.
• 1.2: Tighten any loose clamps and replace damaged hoses.
• 1.3: If a vacuum leak is found, replace the affected component.

3. Fuel System Check

• 2.1: Connect a fuel pressure gauge to the fuel rail.
• 2.2: Start the engine and check the fuel pressure against the manufacturer's specifications.
  • If pressure is low, check the fuel pump and filter for obstructions or failures.
• 2.3: Replace the fuel filter if clogged or the fuel pump if defective.

4. Clean or Replace MAF Sensor

• 3.1: Disconnect the MAF sensor connector and remove the sensor from the air intake.
• 3.2: Clean the MAF sensor with MAF cleaner and allow it to dry.
• 3.3: Reinstall the sensor and reconnect the wiring harness. If defective, replace the MAF sensor.

5. Inspect Fuel Injectors

• 4.1: Use an injector cleaning kit or take the vehicle to a professional for injector cleaning.
• 4.2: If any injectors are faulty, replace them with new ones.

6. Check ECT Sensor

• 5.1: Locate the ECT sensor and inspect for corrosion or damage.
• 5.2: Use a multimeter to test the sensor's resistance and compare it to specifications.
• 5.3: Replace the ECT sensor if it is out of range or defective.