How can you troubleshoot which part is malfunctioning? Erroe code is PO410
secondary air injection system on 2003 Cadillac DeVille
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Can you look in your Haynes manual and tell me what the code PO419 relates to. I believe it is the secondary air injection code. My check engine light is on, and I have replaced the airflow sensor. It's a 2005 Chrysler Sebring. I do smell antifreeze, which indicates Heater core issue. I don't know what to replace?
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