If you have any knowledge of On-Board-Diagnostics or OBD2 you no doubt know it is a system that monitors your vehicle's performance and will let the driver recognize any problems through the 'Check Engine' light about the dashboard. All car, light truck and SUV manufacturers happen to be mandated to http://www.autogm.it/index.php?option=com_k2&view=itemlist&task=user&id=2287472