'01 E320 4MATIC - Limp Mode issues



From my testing, it seems the car is fine with normal driving, but if you go WOT or just gas it a lot it seems, the car goes into limp mode. If you turn the car off and on again, it resets but will go into limp mode as soon as you gun it again. A CEL came up one time and hasn't gone away w/ shutdown (haven't scanned yet). I searched and it looks like one guy w/ a E420 had the same issue but no resolution. Anybody hear of this and know what the problem could be? Thanks.
Bad cat,bad o2 sensor,bad maf,among other possibles.Get the codes and lets see.
ohlord



