The What! You know, that mysterious device that occasionally keeps your car from passing smog and turns on the dreaded “Check Engine” light. According to a Bosch news release it has now been around for 30 years. First installed in 1976 on the Volvo 240/260 line of cars, its popularity (at least with the Auto Makers) has increased so that it is now on most Cars and trucks. Sometimes with more than one!

Besides causing untold grief and a trip to the mechanic, have you ever wondered what the devise is for? Well, yes it does have a useful purpose, and most of us can breath at least a little better because of it. If you would like to know a little more about this small device you can check out the news release at. 02 Sensor turns 30