Just a follow up, in case anyone searching here needs more info later on. A replacement key for my 2000 C230 was about $190 from the dealer. I had to have my registration to order it, andpaid in advance, took three days and picked it up. As long as the car is original, it comes programmed, just push the button to unlock, get in and go. It even come with the trunk/glovebox key pre-cut.

From what I've read, buy a used key on eBay is hopeless, as the key, ignition switch, and ECU are mated. There is no magic way to reprogramm a used key, at least not for this year C cars.

Only difference wa my OEM keys were black plastic, and the new key has chrome trim.

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2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus