ver tyny ticking noise when car is siting at idle

hi guys!

I have a 2001 GT , I heard a very tiny ticking noise coming somewhere around the air filter box when my car is at idle
something like a plastic object rubing itself with another plastic object. I never heard that since I bought this car. I guess it could be the electrical wires for the oil-heater that is loose. ?

Please advise !

Thanks