Q: Wnat to define the code p410 on 2004 GMC Envoy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I have a check engine light p410 and would like to know what it means.
(1) Answer
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It means there's a problem with the secondary air injection "system".....will need thorough diagnosis to avoid just throwing expensive parts at it though.