There are no additional components aside from two sensors.
They are just replacing components to ensure they last the prescribed interval.
my parents was an older one, which i think required more, but i'm pretty sure the vehicles need something to do with DEF/UREA...i'm not sure they can pass without it...that's the whole issue...other companies had to use it to meet emissions, but somehow, VW was doing it without using the added cost and complexity of a DEF system...which of course we now know was BS...perhaps if it's just a couple of sensors, it might be ok, but i still don't see how two sensors are going to do much to reduce emissions, barring cutting the power in half or something blatantly awful...if all that VW needed was a couple of sensors, they would have simply done that from the beginning as the cost would have been minimal and they wouldn't need to cheat in the first place.