how to fix the P0171 code on my Tesla Model S Original (2012-2020)

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative terminal of the 12V battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, pliers.
• Remove the engine cover if applicable.
• Inspect all intake hoses for cracks or disconnections. Replace any damaged hoses.
• Check the intake manifold for leaks using a smoke test if necessary and repair or replace the manifold gasket as needed.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from its housing.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely before reinstalling.
• Reattach the MAF sensor and its connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition on (do not start the engine) and check that the fuel pressure meets manufacturer specifications (typically around 43-55 psi).
• If fuel pressure is low, inspect the fuel pump and filter; replace as necessary.

5. Inspect Fuel Injectors

• Tools Required: Multimeter, injector cleaner.
• Disconnect the fuel injector connectors.
• Use a multimeter to test each injector's resistance; replace any that are out of spec.
• If clogged, remove injectors and soak them in injector cleaner or use an ultrasonic cleaner.