Privacy on Cars. How to stop data collection and transmission? - tchncs

Couple of months prior, I read an article on Mozilla, where they did a research on automakers and found none comply to good privacy measures. I am planning to buy a used car. I want to know how the data is collected and transmitted. The car comes with a connected app though I am not planning to use it. It also has apple car play and android auto. Should I use those? The article states some manufacturers even records sexual activities. How are they transmitting these informations? Through connected phones? My use is fairly basic, I want to use the Bluetooth audio system in the car for listening to music on my phone. I use maps on my phone. What about car servicing? Can they access stored information?