Hi, Does anyone know how the dealer can check with the SD2 computer the position of the exhaust cams ? I mean, I've heard that because the exhaust cams have variators, the computer gives a signal about the position of the exhaust camshaft... I've read something on this board about 657/657 being the correct numbers... Can anyone verify this ? What is the 657 ? Is it degrees when the exhaust valve open or close or is it something else ? How accurate is this number ? Does the engine need to be running to get a reading ? Thanks for your replies !!
