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FN2 Check System light

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11
My light came on this morning when I started the car. Have tried disconnecting the battery which reset it then it came back again. I understand it's potentially an emissions issue so I'm going to take it for a diagnosis but just wondering if there are any common issues I should be aware of.
The only thing that I can think of is recently my fuel got right down before I filled up just wondering if some crap has been pulled through from the tank. Car is 2011 42 k miles.

*UPDATE*

Bought a fault code reader and getting P0135 which I understand is an O2 Sensor and not cheap!

Thanks,
Paul

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