Hi ! In your Toyota Corolla the are is a horn sensor its a unit with belt or coiled wire it connects horn / air bag that one after steering repair you need to set it I think ITS BROKEN you need to...
I think that was the same problem as I had. If your Corolla is under 120K this problem will be covered. Just take it to your closest Toyota dealer and they should replace the ECU for you at no charge.
Usual places for this car are the oil pump seal under timing cover, valve cover and the o-ring around the distributer shaft
also, check to see if PCV valve needs replacing, this puts excess...