Check engine light at high rpm

[David Wilkinson]

Hi everyone 

I was wondering if I could get some advice on what might be the best solution for a check engine light coming on briefly at high rpm before the gear changes on my auto legacy gtb bh5. I put the scan tool on it and it comes up as cam a sensor.

Another problem, perhaps unrelated is that it only just passed emissions as it was high on CO. 

Any help would be appreciated.

Thanks