Dstc stands for Dynamic stability traction control. It's more than just traction control. There is a yaw sensor underneath the drivers seat. If you want to turn it off press the dstc button 5 times , off,on in succession then it will say dstc off. But the next time you start the car it will be on as its volvo safety.
You may have a cracked relucter ring so causing the system to cut in on right turns.
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