Still use it? Saab went out of business last year.
It was used in Trionic 5 and Trionic 7 (Saab 900, 9-3 old generation and 9-5 for instance).
Trionic 8 (9-3 new generation) didn't use it and for the turbo charged 2.8 litre V6 engine they
used Bosch Me9.
I understand that, your post made it seem like they continued to use it for their newer generation cars that's all.
Not sure if BMW still uses it, but ion sense was used in their V10 engines.