M,
Not sure why you posted this to my private conversation page. You'd get better recommendations if you posted to the full forum so everybody sees it. If you lost all the key fobs, you're screwed. I don't know any way of fixing that for sure. There are probably threads where people have done it. I'd think you need a new ECM or BCM that comes with key fobs or codes for a dealer to be able to program new key fobs for you. No matter what it seems like it will be expensive. You might try asking local locksmiths that are tech saavy if they have better ideas. Maybe some of them know the tricks to basically be able to dupe key fobs from some info from the car. But I have no idea really. Good luck!

I have a 2004 g35 coupe and someone has all the keys and key fobs including remote start fob. If I can't retrieve them then I should --‐--what? Please advise
least expensive approach would be great

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