 But the vehicles that came around that had check engine lights come on because of the fact of a bad thermostat. You know, the computer monitors your cooling temperature. And if it doesn't reach or maintain a certain temperature, it will trigger the check engine light. And what I like to do, same time, you know, when it comes time to, of course, replace this, I would call auto-zoned. Depending on the make and model of your vehicle, you can get vehicle-specific