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2004 Hyundai Elantra Question: P0421- Warm up catalyst below threshold (Bank 1)- where is this located?

 

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laine, 2.0L 4 Cylinder, Imperial Beach, CA, November 23, 2012, 10:03
 Rookie

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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