If I remember rightly it does need a
T4 session, and a replacement
BCU should cost around £20 or so (depends where you get it from). Not sure if ZCS coding is required but I would have thought it was (that being said, the
T4 gurus now have a very easy ZCS coding tool which takes all of a few seconds to implement the changes - I had my retrofitted PDC added in the blink of an eye and we were then able to see real time info for the sensors).
As for
T4 session prices, not really my place to say, depends on the operator, but mine was done (including removing the glovebox and replacing the
BCU, then refitting everything) in under 30 minutes.
If I get it done to the ZT, I'll try and take some pictures, get more detailed info. Let's face it....it more than likely going to happen....