I'm gonna assume you don't have the cars in a garage 
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No, we do not.
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I've actually known a couple of people personnally who have autostarted their cars in a closed garage 
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You'd want to automate your garage door, or at least a window, in that setup I would think...
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This would be a case where the house really is the smart one. 
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I dunno, when it comes to something like that I'd just assume not even attempt it in the house... The thought of a failure and not realizing it is too terrifying
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A smart CO detector or other gas sensor in the garage might be a good idea... maybe even in general.
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That likely won't work. Just a couple starts of the engine, and the sensor gets so contaminated that the device quits working. I have tried this a couple times over the years, and it always ends in failure.
It sounds good on paper though...
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Ah bummer - it was a thought. This article seems to think it's doable for a regular detector though.
Wow, now this is a cool idea! I do the remote start dance quite a lot and this could certainly help.
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It’s a task that’s never safe to automate, IMO too. Good points brought up re: why already.
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I would rather keep my car fob in a tin box to keep the thieves from scanning for it
yeah although they cant hack while it's just sitting there not being used right? Also they would have to intercept exactly at the point of activation.. and be fairly close initially.
But well done @markbellkosel84 ... for doing something that is useful to you, and probably doesn't suffer the issues we are all speculating about.... 
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My car searches for my fob and if its in range the doors and start button become active weather I press the button on the fob or not, them scanners amplify the cars search signal and the fob will respond unless its in my tin box
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I'm about to attempt something sort of in reverse. I'm going to use the homelink transmitter in my car with a garage door receiver and an Econlink zwave contact sensor to activate my alarm as I leave the house. It will be manual but convenient. I am not allowed to use presence-based automation. I realized the zen17 would make a great alternative to the Ecolink but I only need one contact (now).
I'm planning only on activating the alarm (and locking doors, etc), not deactivating it. That may come later.
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Nice!
When you say not allowed. Do you mean your alarm won't integrate like that?
SPAF (spouse/partner acceptance factor) restriction on "tracking apps." My alarm is fully integrated with HE.
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@markbellkosel84 this is awesome!
Ive been trying to do the exact same thing (see post over here: Idea - Automating Locking Cars - #25 by kahn-hubitat ) with a spare relay on my zen17 and and Nissan fob but I can't seem to find two points to solder on the remote.
Can you share pictures of the internals of your fob and how you found the points to solder wires onto?
I've also posted some pictures of the internals of my fob on the linked post and would appreciate if you had any insight on where to solder on my fob!
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Currently sitting in a delayed plane on my way across the country for a week. I'll gladly take some pictures when I get back.
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