And The Fault Code Says....O2 Sensor?
 

Car: 1990 300SEL California Version 103 Engine

Just bought a new/used 1990 300SEL. A beautiful car with 83,000 miles. It was idling kind of rough, but no CEL; or so I thought. I noticed that the CEL was not lit in key position 2, so I replaced the bulb and sure enough, with the engine running the CEL was on and signaling a fault. Not what I wanted to see especially when I had a Mercedes mechanic do a PPI for me.

I did some archive research, checked the onboard LED and it gave me 17 flashes. By Arthur Dalton’s CS 1000 Fault code scanner document, I read 17 flashes as “O2 Sensor Shorted to Positive or Negative”.

I have three questions:
I'm not sure I'm reading the right chart. Can someone please confirm my conclusion?
I assume I need a new O2 sensor, but what exactly does this “Short” mean?
I noticed another O2 fault code called “Signal Illogical”. How do they differ?

Thanks, any help would be greatly appreciated.

Outofspec

Code 17 does mean that the O2 sensor is not controlling the mixture..95% of the time that would mean a bad sensor.

Thanks MB Doc! I got it changed out this morning with a known good used O2 sensor. removed fault code from the LED device and CEL is now off. I hope it does not return.