I have 1996 Mercedes E320 sedan and OBD 2 produced two codes, namely, P0133 and P0411
P0114 points to your emmision system which could be a blocked EGR valve or piping, a broken air line or a none working secondary air injection pump. Suggestion...... don't go changing anything until you're sure which part of the system is malfuntioning, for example, a none working air injection pump could simply mean you have a broken fuse.
ps. The 1996 e320 is a beautiful automobile,I own one myself,enjoy.
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