The obd blocker simply blocks unauthorised communication through the obd port to your vehicle this helps prevent key reprogramming or other unauthorised activities. Today's modern vehicles use many computer controlled systems, from switching the indicators to managing the engine's performance amongst these systems is the car security when an authorised dealer needs to investigate a problem, specialist equipment can be connected to the obd port in the car to send and receive electronic information obd stands for on board diagnostics and is a valuable tool in the right, trusted hands. Van deadlocks can be supplied keyed alike at no extra cost. Our qualified locksmiths are on call 24 hours a day. A note to thank you for the speed with which you sorted out our lock problems my wife has asked me to say what a pleasure it is not to have to struggle with the doors. Clearview group limited accepts no liability whatsoever for content on external links provided by third parties. Users manual: requires adobe reader .