what is the name of the dealership and where is it located????

I just encountered the same problem and the San Antonio MB dealer quote me $3,250 to replace the sensor, ME, wiring harness and O2 sensor, almost sounds like they can a canned answer to this problem. I am really puzzled how oil can travel through a two wire harness back to the ME when it's up hill from the sensor, something does not seem right. I will go back to the dealer and get the fault code or codes and take it to a shop that has been repairing MB for years. I will definitely share your expertise and advice with him. Thanks for sharing your experience with us.

When you guys say "M.E." you are talking about the Control board? They are saying the computer doesn't work because oil got in it?

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

Jezzie,

What happened? Did you get an answer from the advisor? Which dealship was this? If you could I would go back with the car and make them check the codes while you are watching them. Be sure that they just don't erase the code and say the problem is fixed.

Good luck!

__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad