1987 260E Oxygen Light Illuminates

Benzmac,

I have a chronic problem with my 260E with the O2 light comes on and off while I am driving all the time. I have replaced the O2 sensor, fuel injectors cleaned, fuel filter replace, major tune up, replace air flow meter and drained the fuel tank to ensure no water contaminates.
I currently has the car in a repair shop and the mechanic thinks that the KU Control Unit is bad referance part number 0055458032. I recently was told that the Mass Control Unit Part Number 011-545-79-32 was bad. Do you have any suggestions? These repairs and parts are getting very expensive to replace. Awaiting replies!

derankin