What does code P0133 mean for an Acura tl 2.5 1998

1998 ACURA TL
198,000 MILES
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ST8WC80
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I have a 1998 Acura tl 2.5. My check engine light went off and I got Code P0133. What does this mean?
Jun 22, 2012 at 3:26 PM
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DOCFIXIT
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Primary O2 sensor slow to respond likely do to deteriation. Check for exhaust leaks and clogged air filter. If all good replace O2 see diagram
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Jun 22, 2012 at 3:39 PM