A car this age IN02 means nothing.
Mine did that when I bought it... and it kept doing it until I reset it a few weeks ago when I changed the oil (pretty much rebuilt half the thing anyway over last 2 years).
Guy I bought it from was a very genuine older gentlemen who got it serviced regularly (saw receipts etc) but ask a mechanic at any garage, let alone VW, even he won't know anymore how to reset it (if he's old enough to have seen a mk3).
