Hi, sorry to say we have the same problem, with warning light, and intermittent red handbrake warning too!
Sadly this is adding to our rust/ battery etc etc problems … so dispiriting for us.
We’re trying to find someone who can look at this, and praying it won’t be expensive …. had to spend a lot so far!
We hope you have few problems and that this ABS issue, can be sorted for both of us. There are some very helpful folk on this site who may be able to help!
Erwin and Jean