 So, look, what I was wondering is, you know, maybe the O-ring that seals the sensor to the canister was bad. But then we would see a change. And a 457. Right, but we wouldn't see a change in FTP over a sweep test like we do. Right, well, I mean... How are you... Here, let's back up a second. Something just occurred to me. How are you sweep testing the sensor? You're letting the car test itself?