bmw e90 catalytic converter and o2 sensors

[my2shoes]

hello guys i have a 2006 e90 320i, i took my car to the mechanic and the diagnostic machine told me that I have 02 sensor on bank 1 failing and the catalytic converter bank 2 failing, is there a way that this can be fixed and how much is it? I had people talking about powerflow, is it good and does it give enough power, and does it cause error on your car?

 

[GPGrobler]

My advice is to start with the simplest thing first: replace the oxygen sensor and have another diagnostic done.

Unless the car was filled with "leaded" fuel, the catalytic converter(s) should still be fine.

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Have you introduced yourself yet? :fencelook:

 

[Jeppe777]

Does your car idle properly on a cold start?

 

[my2shoes]

the car hangs on start but once it starts it is stable, except when i do a clutch control on the traffic lights, the revs needle fluctuates up and down and when I drive more than 140km/h it gives me that engine caution light and it is slow on pick up and cannot go up hill it seems like I am driving a 1.4