The importance of pre and post scans
As automotive technology develops, advanced safety features are introduced, and vehicles are designed to automatically prevent accidents based on information from various computers and sensors, the proper repair and calibration of these sensors and computers becomes vital to the safety of drivers, passengers, and pedestrians.

There are two main sides to the argument: the original equipment manufacturers (OEMs), which are the automotive names you know: Honda, Toyota, Nissan, GM, Ford, Chrysler, etc all, and the auto insurance companies.
Many OEMs have released official statements saying that in order to be sure that repaired vehicles are safe to drive and the sensors and computers within them are reliable, they need to be scanned before and after repairs.
The pre-repair scan should tell repair technicians whether the computers need to be repaired, replaced, or recalibrated when the vehicle comes into the shop.
The post-repair scan will tell them whether the repair itself corrected (or caused) any errors before the vehicle is returned to its owner. And will assure all modules, computers and restraint systems are working properly.
At our shop we're committed to excellence, so this means assure safe repairs. We follow the manufacturer's procedures and guidelines, so we do perform pre and post scan repairs just like indicated.