2005 Saturn Ion Q&A

2005 Saturn Ion Question: catalytic converter replacement

After an ignition module failure, the cataytic converter needed replacement. I'm getting a P0326 and P0420 code. The dealer also claims that I need to have the PCM reprogrammed. Is that true, and what it that going to affect. The car runs fine. -
Answer 1
There is a Saturn factory Technical Service Bulletin that describes reprogramming the PCM before replacing the Catalytic Converter. -
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Can I go to any repair shop to have my Catalytic Converter Replaceed?