02 sensor help

hello

could do with a bit of help i got the emissions light on today and i scanned the car and i got 02 sensor circuit no activity detected bank 2 sensor 2

i cleared the code and it came back on again after about 50 miles same reading no i guess i need an new sensor has any one used the universal ones and are they any good or am i best taking the £98+ vat from audi and oem

if any one has used the universal ones which whire goes where as the ones i have seen do not have the conectors on for the car you need to crimp them your self


thanks for any help

dom