https://electrek.co/2025/10/22/tesla-recalls-recent-model-3-...
Model Ys still have a separate, standard 12V battery that power many of the car's non-drivetrain related parts. So in this case, the battery pack contactor failing open would cause the car to lose the ability to drive, but the doors/windows/lights/screen would all still likely be working.
Pet peeve: The phrase is "one of the few," not "one of the only." If something is "only," it can't be "one of" something.
It is perfectly acceptable to use only to refer to a select group.
In the dishwasher example, "only" refers to "moving parts" which is a collective singular, like how "baseball team" is properly an "it," not a "they."
Same goes for the compsci example. By modifying the plural with adjectives, you narrow its scope.
Either way, the usage in the original comment was exactly the same as the dishwasher example: "the only moving parts are X, Y, and Z" => "X is one of the only moving parts".
It would be more correct to say "there are only 4 positive integers less than 10. 8 is one of them."
https://www.merriam-webster.com/dictionary/one%20of%20the%20...
You find them in motor starters, you can use them to switch multiple light circuits with a single switch, among other uses.
The contactor is what connects the battery to the motors to provide them with power. If the contactor is bad, power cannot flow from the batteries to the motors and the car cannot be driven. I believe the rest of the electronics are powered from a 12VDC battery, all of that would still work.