I have a p0440 code and this code happened after cleaning the lift bolts, which I had a code for and that is why they needed cleaning. It took 300 miles for this p0440 to come on. I looked in the hoods and the hoses look fine as far as I can see. My bf had to disconnect the battery to look and now my stereo doesn't turn on. I don;t know if he caused that or what to do. The stereo fuse looks fine. Please help thank you. I need to smog and reg was due in April and it is just sitting in my driveway along with my cobra which also had an emissions code so I am unable to drive anywhere.