So on my other halfs aum 1.8t its had these 2 damm fault codes since buying it last year. 17705 air leak. And the other for sai incorrect flow So far i have replaced Maf Hockey puck all the hoses under the inlet with silicone jobbies. Recirc valve Spark plugs All filters Cleaned the tb Blocked off n249 and used silicone hose so dv is mechanically controlled. Still same damm fault codes. Car pulls well low down but goes really flat above 4k Cant find any split pipes or loose connections Any suggestions or help is welcome as im at the end of my tether now!