Steve,

How much adjustment can the oxygen sensor do, especially in a 85 190E 2.3? I guess if the mixture is totally out of line, it won't be able to get it totally back, right?

just checking, since i just got my O2 sensor replaced, which solved a bunch of problems I had been having the last one year.

Also, does a working O2 sensor mean that the fuel mixture adjustment on cold engine is also redundant?

thanks.