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From: Andy Burns <usenet@andyburns.uk>
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Subject: Re: Linux founder tells Intel to stop inventing 'magic instructions' and 'start fixing real problems'
Date: Fri, 17 Jul 2020 09:35:11 +0100
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VanguardLH wrote:

> I wonder how a car knows a gas sniffer is poking up its ahole.  Oooh,
> warm that up first before sticking it in.  I suppose the car's computer
> could notice the car wheels weren't rotating when the engine got revved
> up and the steering wheel wasn't turning.

A bit more complex than that, but basically spotting conditions of the 
standardised tests and switching into an alternate ECU mode

<https://media.ccc.de/v/32c3-7331-the_exhaust_emissions_scandal_dieselgate>

Jump to 57:00 if you just want the money shot, but the whole thing is 
worth a watch ...