I've had problems with charging/draw since I've owned this car, have to disconnect battery when parked, test light between neg cable and battery post reveals draw. Now I'm getting code 25 "High temperature at manifold air temperature sensor OR Vacuum switching valve circuit open or shorted to ground OR High voltage at ATS sensor" How do I check this Vacuum switching valve circuit?? This could solve all the problems of the world if this were fixed. Please help.....