Help. Please explain all the parts associated with the transmission. 3rd time having problems with car NOT shifting. Had Trans Valve Body and Air Flow Meter replaced. Now its the EGS Control Module. Mechanic explained that there are 2 parts to the EGS Module and he only replaced 1 because my car was not leaking any fluids. Is this a common problem? 163K miles

The second part your mechanic referrs to is probably the gear selector switch in the shifter box.
I've seen more EGS codes set from spilled drinks in the selector switch than all other faults combined!
If you decide to have the switch replaced don't let your mechanic talk you into a complete shifter box (BIG BUCKS) the switch is less than $100.00 plus inst.
Mike

Are there any other problems that I should be concerned with in relation to the Transmission? I thought mercedes were built to last (ha ha). I could have purchased "2" C class mercedes with the amount of money that I've spent on repairs....benz1gal