Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
If I owned your car I would replace the conductor plate, pilot bushing, fluid and filter, and clean out the TCM (likely it's polluted by fluid). While I had the pan off I'd also change the pressure regulator springs; they and the conductor plate were buggy in the early years of the 722.6xx transmission. This is all within the skill range of a casual DIYer.
Do you HAVE to do all that? Well, no, not necessarily. But unless they have been previously changed, you run the risk of having to redo a lot of work when you go back in the second time around. And for the moderate cost of the conductor plate and springs, I'd just hit it with both at the same time.
Once that is done, you will also have to have the codes cleared from the TCM by a proper scanner, regular OBD-II won't do it. A good indie or indie transmission shop shouldn't charge too much to do that.
You may wish to read through the excellent 722.6xx FAQ thread in the W210 forum help/DIY stickies, it's a great primer for understanding more about your transmission.
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)