the dealer says i need emission system service but theres no warnings coming on on 2008 Hyundai Elantra

is this normal service for a hyundai?

Asked by for the 2008 Hyundai Elantra
Unless it is a factory recall then no. The OBD2 system will warn you of a problem that needs to be addressed which will turn on you "Service Engine Soon" light. If you light is not on and its not a recall then there is no action required