My first , asking for help, as I always find some answer somewhere. Bought 07 mini s new, now has 69,700 miles. Have been fighting P115c , replaced air filter, hose to turbo, valve cover and mas air flow, code went away and was replaced by p1497. I then replaced noise maker assy with single hose. I have no loss of power, runs great, only fault is it is a little hard to start. Please, need help !