Someone hit me in the front left side of my car it still was driving about a week later then i notice the power stirring light would come on and the car would dive in one gear the power stirring light go off the car would drive fine 2-3 mins...later power stirring light comes back on i took it to the shop and they say i need to change the computer module.. i what to know is this something i can do myself or do i have to take it to a shop and if i can do it how do i do it?