new engine, lights, alarm, doors, bonnet, boot, objective;
public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
    new vid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
    SetVehicleParamsEx(vid,VEHICLE_PARAMS_OFF,lights,alarm,doors,bonnet,boot,objective);
    SendClientMessage(playerid, 0xFF00CC, "Use /ste to start the vehicle engine.");
    return 1;
}
public OnPlayerExitVehicle(playerid, vehicleid)
{
    new vid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
    SetVehicleParamsEx(vid,VEHICLE_PARAMS_OFF,lights,alarm,doors,bonnet,boot,objective);
    SendClientMessage(playerid, 0xFF00CC, "You turned the engine off.");
    return 1;
}
COMMAND:ste(playerid, param[])
{
    new vid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
    SetVehicleParamsEx(vid,VEHICLE_PARAMS_ON,lights,alarm,doors,bonnet,boot,objective);
    SendClientMessage(playerid, 0xFF00CC, "Engine Started. Use /spe to turn the vehicle engine off again.");
    return 1;
}
COMMAND:spe(playerid, param[])
{
    new vid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vid,engine,lights,alarm,doors,bonnet,boot,objective);
    SetVehicleParamsEx(vid,VEHICLE_PARAMS_OFF,lights,alarm,doors,bonnet,boot,objective);
    SendClientMessage(playerid, 0xFF00CC, "Engine Stoped. Use /ste to turn the vehicle engine on again.");
    return 1;
}

ManualVehicleEngineAndLights();