It looks like Opel was doing something similar to VW and has been sneaking out reflashes to fix it since VW was caught. Their testing condition detection was apparently based solely on rear wheel speed (in a FWD car).
http://www.thetruthaboutcars.com/2016/01/report-opel-secretly-fixed-cheating-zafira-diesels/
http://news.slashdot.org/story/16/01/18/2316233/opel-dealers-accused-of-modyfing-the-software-of-polluting-cars
More details here:
https://translate.google.com/translate?hl=en&ie=UTF8&prev=_t&sl=de&tl=en&u=http://www.duh.de/pressemitteilung.html%3F%26tx_ttnews%255Btt_news%255D%3D3652
Looks like the engine goes into "race mode" over 150kph as well.
GM's denying everything:
http://www.thelocal.de/20151023/environmentalists-say-opel-faces-own-diesel-scandal
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