I have a 2005 Toyota Prius 270k Miles This is a used vehicle i bought for a few hundred bucks. I drive it for about a week and the code P0A93 and the VSC light pops up. When i ⁰ the reservoir for turbulence - i saw none whatsoever... So out of caution i replaced the iverter water pump and coolant control valve. However, i still am not seeing any turbulence in the reservoir... the code and light for the VSC is off now but i dont want to continue to druve it if im missing something. Any ideas why there would NOT be turbulence in the reservoir before abd after changing out parts? PS - Both parts are new and genuine Toyota parts.