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Q: location of oxygen sensor called bank 1 sensor 1 on 2004 Acura TL

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Where is the oxygen sensor identified as bank 1 sensor 1 located? I need to replace it, but don't know it's location.
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Bank 1 means where number 1 cylinder is. sensor 1 is the O2 sensor upstream from the cat not after the cat.
Where is the oxygen sensor identified as bank 1 sensor 1 located? I need to replace it, but don't know it's location.
1999 oldsmobile intrique 3.8 liter engine