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Post being replied to

Car repair advice needed - catalytic converter by Ryno

2003 Camry with 200k miles. 6 cylinder. Son's car at college. Error Code P0420, basically saying the cc is bad. Two questions - a friend who runs a transmission shop says the part shouldn't be more than $250-300, and with labor it should be a $450-500 repair. A quick google search says the "average repair cost" on a older Camry averages $1100-1300. Any mechanics out there know what a safe estimate would be? Secondly, another mechanic over the phone says it still could just be an O2 sensor, in spite of the code. Any input would be appreciated.