Evaporative Emission items.
 

If you are chasing down a "small evap leak" or even a "large leak" on a 03-06 sedan, I have your parts.

P0456
P0455
P0440
P0442

I was chasing down what turned out to be a hole in my actual gas tank! Bought a lot of good parts, some new and some used from a part out. Save some headache and get this, it could solve your problems.

Asking $50 plus shipping.

OEM Gas cap.
Evap purge valve (one in the engine)
Charcoal canister with all the sensors and pig tails (incase you had bad wires)
https://cimg6.ibsrv.net/gimg/g35driv...4864288571.jpg
https://cimg1.ibsrv.net/gimg/g35driv...5b25fc075a.jpg

Still have this.

Our cars are getting older and this has most of the items you need to solve the problem. Instead of spending $50-100 randomly like I did.