ABS/TC Lights on

Hi

The dash lights for ABS, TC along with the uphill symbols are constantly alight.

I have recently spent £1k on a new block for the active cornering which I'm sure I didn't need therefore very sceptical about the local "specialists" as I've been quoted £250 (part only) to fix this problem.

He suggested the sensor is picking up a gap and this is resulting in lights staying on!

Any help would be gratefully appreciated.

Thanks