In Germany, all cars mandatorily need to be inspected after two years, or else you're not allowed on the road at all. And they really mean it: I once missed the two year mark by a month or so, and got a nice fine from the officials (luckily, though, in car country Germany, all car-related fines are ridiculously low).

My car has a blinker light in the outside mirrors, the right one of which stopped working after I reversed into a wall with the mirrow. I replaced the mirror glass but didn't bother about the light, given that the ones in the front and back of the car worked perfectly fine. Well, that was enough for them not letting me pass the inspection - I had four weeks to get it fixed, otherwise my car would have been off the road. The repair set me back almost 500 Euros, for an effing small blinker light...