KFSG's religious programming is entirely supplied by block-programmers, who purchase airtime on the station and its sister, co-located KLIB (1110 AM). Programs in Spanish, Russian and Hmong are augmented with long periods of instrumental fill music (during unsold time periods), and UC-Davis Basketball, which purchased blocks of time to air their games in 2007-08.
The station was assigned the call letters KSXX on 1997-11-17. On 2003-03-13, the station changed its call sign to the current KFSG.
KFSG's signal has been reported throughout most of the western United States at night. This is due in part the fact that 1690 is a relatively clear frequency, with the closest station competing being KDDZ from Arvada, Colorado.