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P0421- Warm up catalyst below threshold (Bank 1)- where is this located?

(2004 Hyundai Elantra)
in Imperial Beach, CA on November 23, 2012
I have a 4 cyc single exhaust 2004 Hyundai-
I have one 02 sensor on top of the exhaust manifold; another one just below the flange of the exhaust manifold where the exhaust pipe connects to the exhaust manifold.
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Popular Answer
on November 24, 2012
Your warm-up catalytic convertor is in your exhaust manifold
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