[TheChaoz]

try this code. no enum needed.

pawn Код:

stock SetVehParams(vehicleid, param, bool:status)
{
    if(param < 0 || param > 6)return -1;
    new vp[7];
    GetVehicleParamsEx(vehicleid, vp[0], vp[1], vp[2], vp[3], vp[4], vp[5], vp[6]);
    vp[param] = status;
    return SetVehicleParamsEx(vehicleid, vp[0], vp[1], vp[2], vp[3], vp[4], vp[5], vp[6]);
}

didn't test, but i guess it work fine.