Found error code P0430, how many O2 sensors are installed on this and where is HO2S sensor?

2007 CADILLAC CTS
75,000 MILES
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EJETBOY
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Check engine light on steady, seems to be running fine have noticed slight change in fuel economy, this just started 2 days ago but have not had a chance to look into it deeper
Mar 1, 2012 at 3:52 AM
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JACOBANDNICKOLAS
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There are 4 all on the exhaust before the converter
Mar 1, 2012 at 4:39 AM
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