Every time I check for codes on the DM since having the surge problem cleared up by my Indy, another strange code appears. First it was 12, then 10 and tonight 4,,,, and 4 won't clear. There has been no CE light, so I am just going to dismiss it as an aberation. Strange though.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

I didn't read the entire thread about the surging problem...just enough to figure out it is the 320 that you are having problems with.
In case it hasn't been mentioned...Is the harness in good shape?

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

Sorry,,,, I forgot one of the basics. Yes the 320. I have cut the harness apart in various places and it seems like new yet. The thread was here,
OK,,, I give up
Have had no CE lights and the car is running beautifully.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K

You can't get rid of pending codes until CE or drive cycles on DM.
Try this:
Disconnect bat for 10 min [ or step on brake] and reconnect bat.
Get radio code firsts.