i need a mechanic bmw?

fledermmaus

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hi
i do have a bmw 1998 323is,i does not start,it says it is the 02 sensor circuit -which i believe is the oxigen sensor it has 2 sensor one before catalytic n the other one after i change one of them but it did not started i switch it to see if it will but it did not what can it be?
some help thanks
i did plug in the OBD device and says
PO133g Mil
02 sensor circuit 01/01
slow response
some help thanx
 
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