Is there a way for me to measure the lambda with a multimeter? How do I know if it's ok? And it's not ok, how do I adjust it?

I've read from the mercedes mailing list that if the O2 is bad, the computer will put the car in a conservative/limb home mode (which is why the car is so slow, I suppose). When the computer is reset, the car will be back to normal, but the computer will be back in the conservative mode after about 20 mins - since the O2 hasn't been replaced yet. I've already replaced the O2 sensor, so, according to this theory, I should just reset the computer and the car will be back to normal, right?

Is there any truth to this theory?

Thanks.

[This message has been edited by E. Lee (edited 08-04-1999).]