http://www.carboncleaningusa.com/technical/oxygen- sensor/gas/saturn/aura-3-5-l-224 this does not say...but from experience there is one on the exhaust manifold and one behind the cat~
4 of them, 2 upstream 2 down stream. Usually the 2 upstream fail first.
I got a code to replace downstream sensor, bank 2. Can you tell me where that is and best way to get at it?
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