how can I fix the P0171 lean code on my 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

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative terminal of the battery.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver set, vacuum gauge
• Check all air intake hoses for cracks or disconnections. Replace any damaged hoses.
• Inspect the intake manifold for leaks using a vacuum gauge. If leaks are found, reseal or replace the manifold as needed.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner or isopropyl alcohol, soft cloth
• Locate the MAF sensor in the air intake system.
• Disconnect the electrical connector and remove the MAF sensor from its housing.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.

4. Test Fuel System

• Tools Required: Fuel pressure gauge, wrench set
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (without starting the engine) and check the pressure reading against manufacturer specifications.
• If the pressure is low, check the fuel pump operation and replace if necessary.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Locate the pre-catalytic converter oxygen sensors.
• Use the O2 sensor socket to remove and inspect the sensors for contamination or failure.
• Test the sensors with a multimeter, replacing any that are faulty.

6. Verify Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter
• Remove the fuel injectors and inspect them for clogs using a fuel injector cleaner.
• Test the electrical connectors with a multimeter to ensure they are receiving the correct voltage.