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Q: Not sure if I need a new Cat converter or is it just an O2 sensor? on 2003 Kia Sedona

Engine light started to go on after I hosed off the engine. Light blinks on and off. Not having any signs of a bad converter as discribed on the web. Dealer wants to jump right in and change converter, shouldnt we troubleshoot with new sensors first. Autozone ck'd w/ diagnostic, most likely Faulty HO2S, rich air/fuel ratio, lastly was faulty converter
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have live data read and watch 02 wave forms to determine if o2 is good b4 repl any parts. if unable seek help from mech as not to waste money
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