Three amigos

Hi all.
Just replaced n/s top/bottom steering ball joints on my 2002 td5
(Did other side last year).
Now I have the abs light staying on!
I dismantled again and checked all nice and clean, sensor fitted ok and lead seems fine.
All was OK before the repair.
Where to start please?
Many thanks for any advice.
Andy

Hello Jeja, welcome, Have you a code reader?