WTF? First of all, buy the tire with same diameter. Difference in sizes deactivates DSC. Then see if it goes away, becasue if Speed sensor was out OBD would read it!! Then check speed sensor. and if DSC module/computer is out, check if it is Bosch. They can be repaired. I had mine done for 60$. However in US it costs 300$ I think. still better then buying brand new, or used unit.