Tesla is faulting Amphenol. It's a typical trainwreck with Amphenol being so complicated and obtuse with their datasheets and part numbers, no dates or revision numbers, across seven corporate divisions. It's hell to find datasheets, install instructions, tools etc. There is a coded part number and ATS china part number.
H4 PV and new H4 UTX connectors total four different pins: stamped-and-formed or cold-formed (machined w/Radsok insert), and each needs a different crimp die, and not clear which pins are compatible. I found over ten crimping tools out there, some obsolete for some reason.
The back cap (cable gland) must be torqued between 2.6 and 2.9N⋅m, let me get my magic cable gland torque wrench for that.
These connectors are too complicated for average Joe to properly assemble- the tools/pins are terribly documented. Connectors are under the panel so for many you'd have to unmount every panel to get access for replacing them, very labour intensive.
Can't they do a IR thermal cam scan and look for hot spots, something preemptive ?