When I was an engineering manager at an exhaust company in the 1990's we employed a liaison engineer from Peugeot/Citroen, he claimed then that their engine management systems could identify when the car was being run through the emissions test cycle and change the fueling to pass the test, after the test it would reset to normal road use. Still going on then! PJB


4/4 2.0 Zetec SSL front and rear