The codes are kept in the control unit. Any codes from the old car will be carried to the new location. All the codes except the crash profile/manufacturers control unit code can be reset. If it has a crash code on the used one it is no good.
I mentioned that we had gotten used ones at a savings. I have never had any in stock. I search whenever necessary. I also would buy as close to home as possible when dealing with used parts.
Since you are from N.Carolina, I would recommend Potomac German Auto Parts they are in Frederick MD. 1-800-248-0091. They claim to be the world's largest MB salage yard.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
[This message has been edited by stevebfl (edited 04-12-2000).]