When I purchased my used 2003 Jetta, one of the things that I received was a black plastic tag that has some codes on it. On one side is white lettering, 7 digits, first is a letter and the rest are numbers. On the other side is a white tag with black numbers. Two digits are on top, 5 digits are below. This code bears no resemblance to the code on the other side.

I assumed that this could be an SKC, but from what I read in the Ross-Tech info, the 7-digit codes came from dealers and date and dealer number are needed for them to be useful. They refer to a 17-digit code, but clearly this is not it. There are also 4-digit codes mentioned, but that doesn't fit either.

Can anyone clue me in on what these codes are for?