Odd smell in cabin
 

I have an 07 S that I picked up in May. When the car gets warmed up after driving it for 15 minutes or so it sometimes gets a smell inside that is sort of like an exhaust smell. I can't tell where it comes from. It is like some underhood hot air/exhaust is leaking into the cabin.
Has anyone had that experience?
The other thing that bugs me about the car (and there aren't too many things that do) is the remote button on the door to lock/unlock sometimes will not lock or unlock. Sometimes it's almost instantaneous as it should be but sometimes it is delayed and I have to press the button several times. As I said before, sometimes it doesn't work at all and I have to get the remote fob out of my pocket and use that to lock/unlock the door.
It's like the computer is thinking about it and isn't in too much of a hurry to make up its mind!