Coding key for upgrading the original hill start assistant for Audi A3 8Y OBD adapter codes the vehicle for the hill start assist function highest starting comfort for your vehicle Hill start assistant prevents unintentional rolling back or engine stalling when starting on a slope no additional hardware required Scope of delivery: coding key Note: This coding key can only be used for the same car, but is repeatable on this car at the moment, the respective control unit must be unlocked for a limited time before using the key. This must be done by a workshop with valid GEKO access