[Konstantinos]

If you mean model of the vehicle (for example, infernus)

pawn Код:

if( /* IT'S SALESCAR.. CHECK IT */ )
{
    new
        modelid
    ;
    If( IsPlayerInAnyVehicle( playerid ) ) modelid = GetVehicleModel( GetPlayerVehicleID( playerid ) );

    // Do what you want to do; the modelid is stored to "modelid"
}

Else if you mean vehicle id (for example, 0 (first car was created))

pawn Код:

if( /* IT'S SALESCAR.. CHECK IT */ )
{
    new
        vehicleid
    ;
    If( IsPlayerInAnyVehicle( playerid ) ) vehicleid= GetPlayerVehicleID( playerid );

    // Do what you want to do; the vehicleid is stored to "vehicleid"
}