Just looking at my loom for my OMEX 500 ecu for a 1.8 zetec which I got second hand from luego (just before they went out of business) and there is one wire that I cannot work out. There is a pink cable which comes from a white wire out of the lamba sensor. It comes out with 2 power cables and a ground. Connected to the lambda sensor are 2 other cables that go to the ecu and one that goes to ground. Any one got any ideas what the other one is? Cheers. Rich.

The manual for the 500 is available to download from the Omex web site, which has got a full wiring diagram in it. I know as I've used it myself.
Rich

Thanks, ill take a look.

problem solved. its for 12v. Thanks again.