K11 EML light but no change in performance?

Hello everyone, I recently bought a Micra S (998cc) on an X plate and im having an issue with the EML light coming on intermittantly.

The car is very low mileage and was bought with a brand new throttle body fitted, but the EML still comes on, now when i read the code it reads, O2 sensor circuit low, bank 1, sensor 2. This is read with a Mac tools generic OBD code reader so this same code can cover a number of vehicles, on inspection i have found no chafed wiring or any damage to the sensors or there harnesses, so i am now stumped! only seems to do it if the car is left a couple of days then used for a short trip, long trips have no effect on the EML, also the car runs fine!!! Any suggestions will be gratefully recieved!!
thanks,
Danny
 
I think the two lambda sensors are the same. Swap them round and see if the problem moves...
 
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