Why does my Traction control and VSC lights keep coming on

Possible issue with the ABS sensors, have the ABS module scanned for the information of the issue. Could have been a possible installer issue with the person installing the brakes.

On Toyota and Lexus models that have traction control & vehicle stability control, when a "check engine" light comes on, these two functions, by default, are turned off. The reason for this is that the VSC system uses the engine power to help in the case of a skid or other control problem. The reasoning of the engineers that designed it was likely because if there's a problem with the engine, it can't effectively control the VSC system. However, if there's no other problem with the vehicle, you should have the code(s) pulled and diagnosed by a qualified technician.