Vectra c 1.916vMangerment light on. Got no power seems to be in limp mode ?

Today I replaced my swirl flaps with caps due to swirl bar had broken. But when all conneceted up and started engine manangment light as come on and engine seems to have gone in limp mode. Turbo don't kick in at all. Engine seems to make a louder knocking noise on idle and reving any ideas will help alou thanks