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Discussion Starter · #1 ·
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?
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