The Capristo CLS-1 Lambda Simulator is a programmable oxygen sensor simulator used to deliver the correct Lambda values to the control unit of the post-cat sensor to prevent a Check Engine Light (CEL). This module comes preprogrammed for use with all Lamborghini Aventadors that are modified for track-use. Fitment for Aventador LP-700, LP-750SV, LP-740S, Aventador SVJ Installation Guide Strictly For Off-Road and Track Use Only The CLS-1 is designed for use with Capristo sport cat or cat-delete exhaust systems on the Lamborghini Aventador. By simulating correct oxygen sensor readings post-catalytic converter removal, the CLS-1 prevents fault codes from being stored in the ECU, ensuring clean operation without a CEL. Plug-and-play installation — the module installs in the factory O2 sensor location.