Yeah, Car Shop is really annoying. Here's what you gotta do: Find the Storage Room with the car keys (this can be done in casing mode). then, find the manager and either kill him or tie him down (I kill him because it's easier carting a body bag). Use his keycard to open his office. Find the name of the new IT guy. Hack new IT guy's computer (this takes 100 seconds). Did I mention you need to do all of this in stealth because if the cops are called and the cars get bullet holes, the job's ruined? Anyway, once the computer's hacked, you go back outside to the van, grab some c4, plant it on a nearby construction site, and then go grab the keys. Once you have the keys, Bain blows the c4 and you're on the clock. You then have to drive the car 1000 meters down a winding tunnel, and the controls are so goddamn stiff it's like trying to control a shopping cart that has three wheels that don't spin.
The reason this is all so annoying is the car shop is rather small and doesn't have a lot of good cover. Without a lot to break line of sight, which is what the whole stealth mechanic is built on, I have run into so many situations where a civvie will spot me and trigger an avalanche of detections that it becomes easier to restart. Pretty much all the civvies move, except for ones that are sitting or occasionally the manager. It's widely regarded among the community as one of the worst maps OVK's ever done, and worse, unlike Shadow Raid, the reward isn't really worth it.