K42DJ was first licensed as such in 1994; in September 2006, it adopted the callsign KAEP-LP (meaning Azteca América El Paso), following affiliating with the then-new Azteca America network. The station would revert to its K42DJ callsign on May 19, 2014, for reasons unknown.
The station currently has an application with the FCC to flash cut its channel 42 signal to digital.
El Paso is one of four markets to receive both Azteca America and the original TV Azteca channels (Rio Grande Delta, San Diego and Laredo are the others). Much of K42DJ's programming from Azteca America can also be seen on XHCJE-TV Channel 11 (Azteca 13) or XHCJH-TV Channel 20 (Azteca 7), sometimes simultaneously.