Check Engine Light
Ive seen on other city's using fivem, having a check engine light come on when you have damaged your vehicle to a point where you should get repaired quickly or break down. I think this is especially useful for the PD vehicles as well, during multiple chases ect. I think would be a nice added feature.
Vehicles start to smoke when they're about to break down. But it would be nice to have a feature like this as well