1987 Chevy Camaro failed emissions test

1987 CHEVROLET CAMARO
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TOMICHERI
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Engine Performance problem
1987 Chevy Camaro 6 cyl Automatic 180000 miles

what would cause my camaro to fail emissions test? at 2500 rpm under CO (%) MAX 1.00, AVE .10, MEAS 2.34 they said this is what Failed MEAS 2.34 can this be my oxygen sensor?
Mar 9, 2010 at 8:37 PM
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DOCFIXIT
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Most likely catalytic convertor
Mar 10, 2010 at 10:44 AM
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TOMICHERI
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already replaced catylatic converter and exhaust?
Mar 11, 2010 at 12:46 AM
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DOCFIXIT
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Then fault in A.I.R. if air pump is not pumping air into CAT then CO is not converted into CO2
Mar 11, 2010 at 8:24 AM