could you please be a bit more specific, as there are a great number of bosch sensors. To help you, it would be useful to know the bosch part number, and its intended purpose.
It is my understanding that the BOSCH PTC fast responding temp sensor that has been in the MoTeC catalog for ages is now no longer produced. This sensor worked very well. I have been using a replacement sensor (physically different) 0 280 130 085 and it works as well ast the original one and is less expensive.