Recently, I installed Dispatchworks Pack (DW Pack) from https://www.gta5-mods.com/vehicles/dispatchworks-pack-add-on-oiv-tuning-liveries and discovered that Coqhway2 lighting is not working properly. As in when emergency lighting is activated, the red light is turned on and then it stayed on without blinking. This happened to another add on vehicle I found as well. Luckily, I found a solution. In the DW pack, navigate to dw/dlc.rpf/common/data/. open up carvariation.meta, search for coqhway2. In the siren setting, you see a value of 418, <sirenSettings value="418" />, which is a code on which lighting is used. (Siren setting has nothing to do with Siren, it is just lighting). Notice that the 418 is an item number you can find in carcols.meta which is located at dw/dlc.rpf/common/data/. Search for 418, there will be multiple results until you reach it. (line 15085 to 15852 if you have not modified the document). Then search for 'flashiness' Between the <flashiness> and </flashiness> roughly 7 lines. one of the multiple values is 0 as in <multiples value="0"/>. Change it to a number between 1-6 (I only tried value = '6') and the light will flash like normal. Other add on cars may experience such issue when the number is changed to not 0, emergency lights should function normally again