clicking noise under hood when car off

it might be the iac motor have it checked locally

I had a code for my computer goin bad or possible shortage or electrical. .. Others have said possibly electrical problem

if they are saying your computer bad then check battery for condition including load test first. autoparts do for free. If there is a code you should have told us or at least given the code so we can do a better job. but it could be either

The code given was po601 and I had first got a code for under voltage so I put a new battery in and then a new light switch because my fog lights would not work.. then the clicking noise started after all this..

check this as it may be what this tip is saying like a cracked spark plug they will sound like a click. also have the charging system checked it may be low on voltage. it could also be the fan belt and tensioner . Other than that I have no further suggestions.