I just reinstalled LSPDFR as well as ELS and all the essential mods and added replacement cars (all are ELS vehicles). I added the vehicle model and ELS on their respective folder. All the vehicles are showing and working fine, but the ELS is not working. Only the tail lights are flashing. If I press Ctrl + P ELS box won't open either. Siren works just fine, but I have to press j for wail, hold e for priority and double tap and hold r again for yelp. 

did you press j 3 times?

if yes, did you put in:

ELS<pack_default

and here you drop your .xml file

Every file was in its own place. I found out about the problem. I was missing AdvancehookV.dll on my GTA game directory. 

My ELS is now working fine. Thank you tho...

Hey, i am having this exact same issue, except i do have the advancehook.dll file in my gta main directory. I did everything as required due to the new update that messed lspdfr up. But still, after that my els wont work, and it is still the default e keybind, double tap for yelp, etc. This has been frustrating and i would appreciate it if you could help.