new VehicleNames[212][] = {
   "Landstalker",  "Bravura",  "Buffalo", "Linerunner", "Perennial", "Sentinel",
   "Dumper",  "Firetruck" ,  "Trashmaster" ,  "Stretch",  "Manana",  "Infernus",
   "Voodoo", "Pony",  "Mule", "Cheetah", "Ambulance",  "Leviathan",  "Moonbeam",
   "Esperanto", "Taxi",  "Washington",  "Bobcat",  "Mr Whoopee", "BF Injection",
   "Hunter", "Premier",  "Enforcer",  "Securicar", "Banshee", "Predator", "Bus",
   "Rhino",  "Barracks",  "Hotknife",  "Trailer",  "Previon", "Coach", "Cabbie",
   "Stallion", "Rumpo", "RC Bandit",  "Romero", "Packer", "Monster",  "Admiral",
   "Squalo", "Seasparrow", "Pizzaboy", "Tram", "Trailer",  "Turismo", "Speeder",
   "Reefer", "Tropic", "Flatbed","Yankee", "Caddy", "Solair","Berkley's RC Van",
   "Skimmer", "PCJ-600", "Faggio", "Freeway", "RC Baron","RC Raider","Glendale",
   "Oceanic", "Sanchez", "Sparrow",  "Patriot", "Quad",  "Coastguard", "Dinghy",
   "Hermes", "Sabre", "Rustler", "ZR-350", "Walton",  "Regina",  "Comet", "BMX",
   "Burrito", "Camper", "Marquis", "Baggage", "Dozer","Maverick","News Chopper",
   "Rancher", "FBI Rancher", "Virgo", "Greenwood","Jetmax","Hotring","Sandking",
   "Blista Compact", "Police Maverick", "Boxville", "Benson","Mesa","RC Goblin",
   "Hotring Racer", "Hotring Racer", "Bloodring Banger", "Rancher",  "Super GT",
   "Elegant", "Journey", "Bike", "Mountain Bike", "Beagle", "Cropdust", "Stunt",
   "Tanker", "RoadTrain", "Nebula", "Majestic", "Buccaneer", "Shamal",  "Hydra",
   "FCR-900","NRG-500","HPV1000","Cement Truck","Tow Truck","Fortune","Cadrona",
   "FBI Truck", "Willard", "Forklift","Tractor","Combine","Feltzer","Remington",
   "Slamvan", "Blade", "Freight", "Streak","Vortex","Vincent","Bullet","Clover",
   "Sadler",  "Firetruck", "Hustler", "Intruder", "Primo", "Cargobob",  "Tampa",
   "Sunrise", "Merit",  "Utility Truck",  "Nevada", "Yosemite", "Windsor",  "Monster",
   "Monster","Uranus","Jester","Sultan","Stratum","Elegy","Raindance","RCTiger",
   "Flash","Tahoma","Savanna", "Bandito", "Freight", "Trailer", "Kart", "Mower",
   "Dune", "Sweeper", "Broadway", "Tornado", "AT-400",  "DFT-30", "Huntley",
   "Stafford", "BF-400", "Newsvan","Tug","Trailer","Emperor","Wayfarer","Euros",
   "Hotdog", "Club", "Trailer", "Trailer","Andromada","Dodo","RC Cam", "Launch",
   "Police Car (LSPD)", "Police Car (SFPD)","Police Car (LVPD)","Police Ranger",
   "Picador",   "S.W.A.T. Van",  "Alpha",   "Phoenix",   "Glendale",   "Sadler",
   "Luggage Trailer","Luggage Trailer","Stair Trailer", "Boxville", "Farm Plow",
   "Utility Trailer"
};

GetVehicleModelIDFromName(vname[])
{
    for(new i = 0; i < 211; i++)
    {
        if(strfind(VehicleNames[i], vname, true) != -1)
        return i + 400;
    }
    return 0;
}

public OnPlayerCommandText(playerid, cmdtext[])
{
    new string[256];
    new playermoney;
    new sendername[MAX_PLAYER_NAME];
    new giveplayer[MAX_PLAYER_NAME];
    new playername[MAX_PLAYER_NAME];
    new cmd[256];
    new tmp[256];
    new giveplayerid, moneys, idx;
    cmd = strtok(cmdtext, idx);

    if (strcmp("/engine", cmdtext, true, 10) == 0)
    {
        new vehicleid = GetPlayerVehicleID(playerid);
        new vehiclename = GetVehicleModelIDFromName(vname[]);
        new engine, lights, alarm, doors, bonnet, boot, objective;
        GetPlayerName(playerid, sendername, sizeof(sendername));
        if(IsPlayerInAnyVehicle(playerid))
            {
                if(GetPlayerVehicleSeat(playerid) == 0)
                {
                    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
                    if(engine == 1)
                    {
                        GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
                        SetVehicleParamsEx(vehicleid,false,lights,alarm,doors,bonnet,boot,objective);
                        format(string, sizeof(string), "%s stops the engine of the %s.", sendername,vehiclename);
                        ProxDetector(30.0, playerid, string, COLOR_PURPLE,COLOR_PURPLE,COLOR_PURPLE,COLOR_PURPLE,COLOR_PURPLE);
                        return 1;
                    }
                    else
                    SetVehicleParamsEx(vehicleid,true,lights,alarm,doors,bonnet,boot,objective);
                    format(string, sizeof(string), "%s starts the engine of the %s.", sendername,vehiclename);
                    ProxDetector(30.0, playerid, string, COLOR_PURPLE,COLOR_PURPLE,COLOR_PURPLE,COLOR_PURPLE,COLOR_PURPLE);
                }
                else SendClientMessage(playerid, COLOR_ERROR, "Error: You are not driving the vehicle.");
                return 1;
            }
            else
            SendClientMessage(playerid, COLOR_ERROR, "Error: You are not in a vehicle.");
    }
}

new vehiclename = GetVehicleModelIDFromName(vname[]);

new vehicle;
vehicle = GetVehicleModelIDFromName("Infernus");
if(vehicle != 0)
{
       Use it 
}
else
{
       invalid car
}