I was staring at the keys for my F-150 today and was thinking.. why?
GM used to advertise this as an anti-theft feature! Probably not a very effective one, but I guess it gave them some way to respond to the fact that their '70s and '80s cars were so easy to steal. Once they switched to the PASSKey system (chipped keys) in the '90s, they got rid of the dual keys.
^^ Every car I've owned had a pair just like those. I even have a vintage "Delta 88" fob keyring for my current set, like the ones they used to sell on big racks at the parts stores back in the day
I guess they never thought about a person trying to get in the car quickly fumbling with the keys trying to grab the correct door and ignition keys...
I just figured it had something to do with the tech of the time, and maybe they wanted to keep the ignition key different than the doors because using the same key for both might wear it out sooner (this was before keyless entry). (shrug)
LOL GM keys. I don't think I even have an original ignition or door key for my '78 Pontiac. One time I lost my only set, and as luck would have it my little brother had a ton of keys that he used to collect when he was little. The 3rd one I tried started the car! I also found one that worked in the doors. I also buy and sell some glove box latches for late 90's GM cars. If I have one of the "dual cut" (or whatever the term is) keys from any GM car from that era, chances are I can get it to work perfectly in one of the dozen or so latches I have laying around. It's funny selling a Buick latch with a Chevy key.
I have this on my Audi, but not from factory. My keyless entry broke, and the ignition key hole broke at one point, so we had to get a new one. So now, I use the old pattern to unlock the car and the new one to start it.
Now if only I could get that to work on my Integra...
On that note- I know people that walked up to their vehicle in a parking lot, used the keyless entry to open the door, got in, then realized the key would not work on the ignition- then key realize they are not in their car.
So even keyless entry has a limited number of codes.. or at least they did back in the 90s (when that happened).
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Since i built my car and everything is aftermarket i now have 5 keys for it. Kind of a pain but i try not to let little things like that bother me..its just a MK2 afterall