high co on smog test

[big monkey racing]

i just had my smogged and it failed due to high co so i changed the o2 sensor which i questioned was bad anyway. i also found what looks to be an evap leak. i dont know how to put on a pic but i heard the leak on the vacuum line on the canister. its the big one towards the back of the engine. do you think i need to look somewhere else before i try again.

[compactfean]

The cts can cause big time high co failures a well.