"Dave P" <email@example.com> wrote in message
> Since no-one else has replied -
> I don;t know for certain, but I am pretty sure this has to be done by a
> dealer with test book. I've never heard of a way of doing it DIY.
I have a late '01 Td4 and didn't realise I had one.
Just looked down the list of warning lights in the handbook and whilst there
are loads of them nought like that is included.