I have a 2000 V70XC with 70k and the CEL came on, so I took it to autozone and they read out code 0455. The guy at the store told me that I probably just need a new gas cap. I read somewhere that it could be a vaccum line. <p>Will this impact the performance or hurt the car at all if I don't fix it? <br>Has anyone had this code before? If so, how'd you fix it?<p>Thanks!