0053 Fault Code Thruxton Rs

Hello the witty and wise, any one have a definitive code reading for 0053 on a Thruxton rs ?
Just about to go on a road trip with me Bro and the engine light is on, would like to get it sorted asap
many thanks

 

Thanks Robbi, any indication which sensor (left or right if your sat on the bike)
Off to the isle of Man next week and really struggling to find one to fit before we go