Well, this is, this sensor also gives the revolutions, when it does not work well, it gives pulls, it does not pass from 60 km/h, it does not mark rpm, the light is turned on ... Cambial it, it is about about 30 EUR (FAE), if it is Bosch it comes out about about 60 or more, it is a typical breakdown in the Mot Dth Vectra Dth, (this sensor is in the front of the block, seen in front) it易于更换(TORX螺钉)。问候!!