Has anyone's else oxgyen sensors gone faulty after 9500 miles. Ok my average mileage on each journey is only 6/7 miles and have been advised this could be the problem. I know loads of people who only do short journeys and no problem - but I suppose its down to the actual component and different manufacturers have better quality parts? (my car is a Micra - new style)

Surely the car is still under warranty. How did you discover the fault? Also, depite the low mileage, is there a service history? If so seek contribution from Nissan if out of warranty.
Or try caning it to see if it clears (Italian Tune Up . . . .)

LOL why do cars have such complicated things on them, it would be so much easier to just have a carburettor with a direct linkage to the throttle pedal.