[sm9ai]

Hi All,

I have a Mini Cooper R56 with a standard 1.6 engine.

The car keeps throwing up a P0420 code and some people have mentioned a small amount of Blue smoke (however, I haven't seen this myself)
The cat and o2 sensor have been changed but the code keeps coming back, any ideas where I should next be looking?

Is the Blue smoke related to the P0420 code?

 

[sm9ai]

That is what I was suspecting from reading about this.

Is there any guides on changing these?