I'm not yet convinced the ECU got shorted and burned, but maybe I'm just in denial since that's certainly plausible. Had 8 codes after a long drive today (seemed to run and shift better, but not certainly not right). Not sure how many it can store. It was a laundry list that included not just one, but two 02 sensors. Tried to clear them, but three would not clear with my simple OBDII tool which still leaves me wondering if there are VADIS codes stored which will not let it out of limp mode until they are reset and further if driving in limp mode can then set more codes.

Regardless, unless just driving it far enough with the O2 fixed (if it is fixed) causes the car to realize things are OK, then I will take it to a shop next week to get a verdict and they will be able to read-reset VADIS. I'm willing to spend for that diagnosis, but if the cure is a new ECU and that's $1200, then I think I might just have to be satisfied with the trouble free and relatively inexpensive couple of years I had taking this car from 170K to 204K. That would be a shame since it's otherwise a nice car, but an oil leak and AC not working make it hard to invest $1200 in it rather than into another used car.