MY 88 560SEL idles high at idle. Also, the ABS light is constantly on. I was told that this combination means that the problem lies with the OPV. Where is the OPV & what does it look like? I read on this board that it is behind the battery but I looked back there And I don't think that's where it is on the 560SEL.

If someone could help me out with this I would really appreciate it.

-Chris