2010 BMW 650i E63 Catalytic Converter fail code O2

[mmakabeh]

2010 BMW 6 Series 160K miles

Hi,
My engine light is on.
Fail message :
bank 1 and bank 2 readings bad
- replaced all 4 O2 sensors same fail codes ?
Also once in while maybe 1,2 a month my car smokes blue smoke for 20 seconds and stops
Specially if I reset the error codes.
Please advise.

[White94RX]

You posted in the wrong section. This is the F30 3 series section. Secondly, post the exact codes your car is showing with the fault code descriptions. And I hope you're not using some generic OBD code reader.