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what to do next on 2003 Audi A6 Quattro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my check engine light came on and I was told by a service machinic that it has to do with the cat not warmming up what do I need to do next.
(1) Answer
Which engine? I don't think the 2003 models came with heated cats. Are you sure it was not the O2 sensor heating or cat. converter efficiency code? Do you have the exact code?

Zee