IRS Swap ABS sensor question

So I finished the IRS swap and took it out for a spin. The ABS light was on immediately. I know they're plugged in and routed correctly. Any other reason why they would be on immediately?

Thanks!

And by on immediately, I mean the ABS light never shuts off from start up. Only thing I can think of is that one of the sensors is bad.

One of my sensors went bad without warning and did the exact same thing you described. I believe there is some sort of resistance check at start up and if it fails, you get the light.

I’ll see if I can find a replacement set.

I have some I'll sell you. Your best bet is to go to your friendly shop and get them to run a scan to tell you which one is bad. It won't be a standard obd scanner, it's a body module scanner. Then replace the bad one. Mine went bad with no advance warning 8 or so years ago and I replaced it with one I pulled from a car I was parting out and I'm still running the originals from 1999 on the other 3 corners.

Price? I’m afraid it would probably cost more at the dealer to run a scan than it would be to just replace them.

$40 shipped for both rear or $25 for one.