My ELS was working fine one night and now its not functioning properly. There hasn't been any updates or changes to the game or files at all, when i get into a police vehicle and activate to stage 3 lights, only 2 steady burn lights activate and all other lights are switched off. Also the siren still works fine, and traffic and peds still react as normal when running code. Is this a common problem people have had? Any one know how this problem has occurred. This has effected all emergency vehicles in the game. 

Im no expert. But a lot of my problems with ELS in the past have been fixed by a simple computer restart

 

I had that exact same thing happen and a computer restart fixed it, like Jet said.  Don't know why that happened but it did.