Me not really sure with the ion 16,
Suppose you could try entering installers menu, then select that particular sensors ID and delete it, then relearn it back onto the system,see if that works.
Not sure if you have to create a tamper on the sensor to learn it on them,me would have to read the book,then get back to you on this.
But I defo know a man who knows these jobbies.
Gts where are you old pal?
Ps don't forget to thank him cos he good guy :)
If I find sumthing I will add but as I say I only have little knowledge on these,gts is your man. :)
e manno
August 2013