I apologize if this has already been answered here or in another thread. I am currently in the market for either a ULF module or and TCU/SES combination. There are several on eBay, but most ads market them as being specific to certain models/series.

Up until this point, my understanding was that a particular ULF, TCU, or SES module would work in any car, with the limitations being age of the module relative to the car. Are these modules also model/series specific?

Also, is there any difference between a ULF Module and a ULF Module, High?