My wifes 8500 (non X50) started displaying calibration errors and recently now service error.
So to warm her up to the idea of getting a 9500ix I swapped detectors between our cars. She liked the 8500 and didn't like the 9500ix because it's clumsy to hit the mute button on top of the 9500ix but easy on the 8500. We mount both on the headliner.
Anyway now the 8500 is working fine in my car.
8500 has been in her car for a long time, like 5 years?
I turned on the 9500ix Voltage display and it said 14.1 Volts while it was running. Which I believe is about right for when system is charging.
One odd thing though when I put the 8500 in my car it did display the Service error. But the next day it ran fine and has run fine since. I was not sure if the 8500 had remembered the failure in her car and took a while for it to recheck itself.
I've read about cars causing the service error message and wondered what voltage is too high or too low to cause errors and what types of things that could develop in a car to cause a voltage issue and still read a normal 14.1 Volts.
I'll have her keep an eye on voltage and check that it doesn't randomly spike or something.
Her car is a 99 Passat and mine a 2003 Jeep Grand Cherokee.
Both detectors are happy at the moment with them swapped.