My opinion is that the split in your NSF reluctor ring was, and still is, the cause of the ABS light.Had the ABS light on, which I traced to a sticking rear caliper piston. That's fixed now.
When looking for the problem I found a small break in the NSF reluctor ring. It has opened up less than 20 thou and seems to be giving no issues (yet). It looks a bore to change the CV joint and I'm thinking of putting a spot of glue in an attempt to hold it off for a while.
Has anyone else successfully done this, I think the issue is going to be getting it clean enough for the glue to work.
Oh and is the 180 CV any different to the 120.
I have had a sticking rear cylinder and it did not give any indication via the ABS system but a split ring on the front did, by way of producing an intermittent clicking noise from the ABS pump.
It is in fact as easy to change the CV joint as it is to change the reluctor ring. The procedure is very similar except when fitting the ring you have to remove all residual corrosion from the surface of the CV joint before fitting the new ring.
Don't see that filling the gap in the ring with glue will serve any useful purpose.
Oh, and from the information I have, the 180 shares it's CV joints with the 2.0L diesels, 2.0L 4 pot petrol, and all KV6 engined 45/MG.