ROLLOVER Controller - ROC Repair Basic Information: Convertible Models of E series BMWs and Mini have separate controller/sensor for Rollover Protection(ROC), these models are: BMW 1 series - E88 BMW 3 series - E93 BMW 6 series - E64 Mini Convertible This controller is an essential member/subsystem of vehicles safety system, and is responsible to detect and activate guards for rear passengers in case of cars rollover. Problem Description Often, when cars battery is replaced or reset, or gets flat, this controller goes bad, and safety system (Airbag module, also known as MRS or ACSM) registers error: 9402 Rollover-protection controller: internal fault Solution We offer repair of these modules. How it works You will need to send us failed module, we repair and ship it back. As majority of our services, it is same day turnaroundYou can find ROC module at this locations: E93 E88 E64 Mini Convertible ** Please keep in mind, The shipping type you choose during checkout, is for return shipping only.