Yeah, it shouldn't be that hard to find. (if it is there) Maybe call the previous owner and ask him to point it out. Maybe there is a way to check if you actually have one. Like maybe force the car to hit fuel cut once or twice. It should be around 10-12 psi. I might be wrong on those numbers for sure though. There might be a safer way to check through the diagnostic block. I dunno. Maybe I use the word maybe too often.