You could add a $100 mobile phone, which auto-calls a service center. If 1% of cars get "bricked", that's $10,000 per car saved, not including intervention costs. Even with some false positives, it would be worth it. Of course, that cost is carried by Tesla, not the customer.

"The Tesla manager called me to warn that my car was in trouble" is a much better customer experience than "my Tesla broke down, and cost $40k to fix".

Cars used to have the same problems with oil changes. This got better, as customers were educated (at the cost of a lot of cooked engines), and cars were able to warn their owners, and run for longer without oil.