Again, you are using info for a 210 E320 w/OBD2 instead of a 124 chassis E320.
Your car is a 124.032 w/OBD1 and it does not have downstream sensors..it has one 4 wire sensor.
And looking at your codes . I would check the 12v to the sensors heater and the heaters coil before doing anything b/c that is what your codes indicate.

You have a 1995 E320-124 chassis. Here is what you have:

http://catalog.peachparts.com/ShopByVehicle.epc?q=1995-Mb-E--3--0--Sedan-Fuel--Injection&yearid=1995%40%401995&makeid=MB%40%40MB%40%40X&modelid=E%2D320%2D001%40%40E+320+Sedan&catid=C%40%40Fuel+Injection&subcatid=C5010@@Oxygen+Sensor&mode=PA

Here is the sensors for a 1996 E320. That is a different chassis , even tho it is still a E320. Notice it is not a 124 chassis, but a 210.
Always mention your chassis when asking questions on E320 [ or year] b/c they are very different in many ways. Like 02 sesnsors.

http://catalog.peachparts.com/ShopByVehicle.epc?q=1996-Mb-E--3--0--Sedan-Fuel--Injection&yearid=1996%40%401996&makeid=MB%40%40MB%40%40X&modelid=E%2D320%2D002%40%40E+320+Sedan

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A Dalton