[Konstantinos]

This callback is called when a player starts to enter the vehicle but he's not in yet so GetPlayerVehicleID returns 0.

pawn Код:

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger) 
{ 
    if(GetVehicleModel(vehicleid) == 604) SendClientMessage(playerid, 4, "Your are in a damaged Vehicle."); 
    return 1; 
}