SEAT

Hello, guys. I come with a problem about my car. My car is a Leon 1P from 2008 and 2 weeks ago i saw the steering wheel light (yellow) on the the power steering was still working. 3 days ago while i was driving the light became red and the power steering was completly off ( the steering wheel was very hard to move). After that i went to a mechanic who used a tester and said that there is a problem with a power steering sensor (G something if i remember corectly) and he reseted it. After that the steering wheel was again easy to move and the power steering light was off but after 2 days it appeared again (yellow this time and the power steering is functional) but i am afraid that i will face the same problem again in a short time. Any suggestion from someone who faced this problem?