Dealer says I need a new catalytic converter
Took my 2007 with 16,000 miles to dealer when CEL and flashing cruise came on thinking it just needed to be reset. They told me I need a new catalytic converter and have ordered one. I took the car right after that for an oil change somewhere else, and the lights stopped flasing and haven't flashed since.
We had warm wet weather and then freezing cold weather the next day and that's when it happened. Is it possible that the dealer is wrong? Or should I just let them replace the cc?
Would their tests show absolutely that I needed a new one?