I had the tire pressure sensor replaced but the light stayed on

What is your question?

My car became difficult to steer and the "tire pressure sensor default" light came on. I took it to a shop and they changed the sensor. When I left the steering was still difficult and the warning light came back on. I don't want to take it back to the same shop because I was not comfortable with their work. Is there a sensor in each Tire and if so how is the faulty one determined?