Is my Nissan Micra 1995 M reg injection?

Hi -


I have a Nissan Micra LX 1300 and it failed its MOT (exhaust emissions carbon monoxide after 2nd fast idle excessive) - I'd like to know if it is injection or carburetto driven - and if it is possible/ necessary for me to change the cat? My brother says it is quite difficult - and I can easily blow the new cat anyway .. (if it was the cat re high emissions - another mechanic says it is not necessary to get a new catalytic converter - I need merely to adjust/ lower the petrol .. (my bro says I can't - it's injection) - What's the answer?