Oxygen sensor relay location

[Rusty Bavaria]

I'm chasing down a rough idle problem and as I'm running down the list of possible causes (and since I already replaced my O2 sensors with no change), I wanted to test the relay to the sensors, I found the diagram and chapter in the Bentley about this, but my e-box looks a bit different than the diagram, and I can't tell which relay is the one I want.

What's the color of the relay, or what is the best way to figure out which it is?
Trace the wires back to the relay...or is there an easier way?


Thanks in Advance
Jim

[Ross]

I THINK it's the furthest outboard. To confirm it the wire colors to it are red/wht brn/blu grn/vio red/blu
Hope this helps

[Rusty Bavaria]

Perfect Thanks!
Now if I would have thought to ask this yesterday when it was slightly warm out...

jim

[yaofeng]

Are you sure the O2 sensor has a relay? The o2 sensor actually generate a weak voltage when working. It is not used to switch on any other electrical device, is it?

[Dave M]

I THINK it's the furthest outboard. To confirm it the wire colors to it are red/wht brn/blu grn/vio red/blu
Hope this helps

You are correct sir :D

http://img.photobucket.com/albums/v11/dave_macisaac/Bimmer/Fuel%20Pump/DSC00502.jpg

Dave M