[320sean]

hi there,
my problem is that my car has a strange symptom,sometimes when i turn right on roundabout or round the corner the dsc light comes on and car looses the power,it never happens when i turn to left doesn't matter how hard,sometimes that light comes up at high speed at motorway when i push the accelerator all the way down,had it diagnosed but no fault codes,tyres are as new and pressure checked,is doesn't happen all the time but mostly when i stuck in heavy traffic,
is it dsc unit or wheel speed sensor?it's a 320d 2005,2l engine
thanks a lot