I don't know for how long, but probably quite a while. The previous owner did some stupid hacks (cut off the exhaust, pulled the ESP fuse etc.), so I doubt he ever looked at it.
I can check the O2 sensor live data with Star and see, plus try unplugging it and see if it makes any difference.
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'95 E36T AMG (124.092)
'98 E200T (210.235)
'00 E430 4Matic (210.283)
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