I just want to be able to install replacement parts without paying a dealer to tell the car everything will be ok. Or even changing options like the passenger

I just want to be able to install replacement parts without paying a dealer to tell the car everything will be ok. Or even changing options like the passenger seat seatbelt alarm (I often have heavy boxes or a dog jumping in my passenger seat so get this alarm a lot). You can ask a dealership to uncheck the box for that alarm, but you are entirely at their mercy and many will refuse.