ABS/ESP warning light

Afternoon Lads,

Sorry if this is in the wrong section, just having a look at my 56 plate 197 at my mates garage.

After having 4 tyres and tracking done in getting an error with the ABS/ESP sensor.

Took it back and they couldn't see anything that would have caused it but will try take it there next week if it's still an issue.

Any idea what might cause this or a fix for it?

It seems intermitmant and sometimes I can enable/disable the ABS/ESP system..

It's causing the service wrench to come on.

ABS/Traction control don't seem to work when the errors up!

Any help/suggestions would be appreciated.

Cheers,

Matt