Among the 281 owner complaints naming this part, catalytic converter is named in 29% of them, more than any other part.
Other parts named in the same complaints. Catalytic converter: 29%; Spark plug: 13%.
Owners name the catalytic converter most often in the same complaint, which is not proof that one caused the other. Ask the shop whether it checked the catalytic converter too, so you are not quoted twice for one visit.
Data and chart by CalcScrape: Oxygen Sensor Replacement Cost Calculator