Have a strange one for you.
Since doing my chains and water pump, I've had an issue with the ABS light. When turning the ignition on for the first time of the day, it stays on, turn it off and back on and it clears, ABS and traction control work fine.
My initial thought was that I may have upset the unit when disconnecting the battery while doing work, though could this be a stored code or something else?
I would use Opcom but Windows 8...
Any help appreciated, cheers!