Question: Where does a catalytic converter go on a car?
Disambiguated questions and answers: question: Where did the first catalytic converters go on cars?
Where did catalytic converters go on cars after they were placed close to the engine?
Where did catalytic converters go after they were placed a third of the way back from the engine?
answer: close to the engine
third of the way back from the engine
underneath the vehicle
Natural Questions answer: underneath the vehicle (from the Wikipedia article "Catalytic converter")