I have a 2004 Malibu only 113000 miles and all of a sudden it was making a wuerd ticking noise I've been told it's the liftrrs,the cam,the oxygen sensor ,the cylinder etc. Any ideas and how much to diagnose it?

The question forum on google maps is for people to ask questions related to a business, not your issues with with your car. Call the dealership or a mechanic.

You would have to talk to a tech. Diagnostics are easy if the check engine light is on, they can just pull the codes. But if the check engine light isn't on, then it's really a matter of looking at the car, and going through probable causes until you find the right one. Could find the problem right away, could be the last thing they check.