I have a intermittent p2097 code on my mini r56s how to solve?

What is your question?

I have had power loss and bad mpg for months.changed 02 bank 1 sensor.the car struggles to accelerate. The car also smells like eggs.can also smell fuel in the car,I assume coming through the vents. p2097 code comes and goes,it has never thrown a warning light on the dash.also catalytic converter wont set ,tried the drive cycle.changed bank one sensor as this seems to have a fail when the p2097 code shows but it resolves it self then comes back after a while.car takes a couple of turns when hot or cold to start also.could the exhaust course these problems.

What makes this problem better or worse?

Nothing

How long has your 2007 Mini Cooper had this problem?

4 months