Air Leaking Noise

[HanJo Lee]

Hello all,
I have 2005 Infiniti FX35 and I've been hearing this air leaking noise from rear (don't know where) when the car is idling.
I don't know whether it is coming from Tire Pressure Monitoring Sensors or the exhaust.
I don't think the tire pressuring sensor will make air leaking noise.
Could it be that sensors checking tire pressure??
or maybe it's coming from the exhaust which it might have a hole and air leaks?
Please let me know if anyone is experiencing this same issue or if it's normal to make this kind of noise...
I will definitely bring this up when I go to my dealership for an oil change next time, but figured if I could get some help from you guys first
Thank you all in advance

 

[jbaker1121]

you may just have an exhaust leak


it would not be the tpms

 

[HanJo Lee]

Is an exhaust leak really a big problem??
Does it need to be fixed??
Because I've been hearing this noise for a long time from the very beginning...

 

[jbaker1121]

if you've heard it form the very beginning then maybe it isn't an issue?

 

[turbocad6]

your probably hearing the fuel pump... it's in the fuel tank under the rear seat & makes a hissing noise if you pay attention to it, if it's very loud then the pump may be going or the filter may be clogged enough to cause it to strain...

 

[HanJo Lee]

So does this need to be fixed??
I mean is this a really big problem??