I agree that diagnostic-port reprogramming at the point of theft is uncommon (although absolutely not unheard of). I'm not sure what the effect of that observa

I agree that diagnostic-port reprogramming at the point of theft is uncommon (although absolutely not unheard of). I'm not sure what the effect of that observation is, though - key and immobilizer security is extremely important still, because cars which are stolen by any mechanism (tow, stolen key, transponder relay, etc) then need to be resold or broken down for parts. Especially in Europe where control module security is generally both more robust and more insurance regulated, many parts on a stolen vehicle are increasingly not valuable unless the immobilizer / key enrollment system can be bypassed.