On a Mazda 626 I once had, it wanted a code when the battery was replaced but they all came from the factory with the same preset code unless you changed the code. I'll see what I can find out. Meanwhile, I'm moving this to Audio and electronics s where you will get more responses on it.
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Sig by Woobiee
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1999 528i 5 Speed, Sport Package, Confortti Software, Racing Dynamics Front Lip Spoiler and Rear Apron, Supersprint Muffler, Angel Eyes Upgrade.