Have Toyota Questions? Ask a Mechanic for Answers ASAP
Please keep in mind that the vibrations are very difficult to deal with in this type of format because I cannot feel the vibration or see what's going on with your car. Is there anyway you could post a short video clip of the steering wheel vibrating or the the engine compartment of vibrating when the problem is occurring? I would strongly recommend that you get your money back for the misdiagnosis a simple trainee technician could've told you that the tensioner was not going to cause severe vibration when and drive. Maybe a rattle but that's about it. Do you have the Vehicle Identification number?