Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1068 Post(s)
I see you did not found yet the W210 section where your car belongs.
One of the most active section on the forum with stickies that already covered a lot of transmission troubles.
Per your description I conclude that your computer board might get contaminated with ATF.
Most of the time $10 can of MAF cleaner is all it takes to put the car on its wheels, while replacing $5 plug adapter would make the repair permanent. ,,,, at least for next 16 years.