p0420 Catalyst System Low Efficiency
Threw the code today. The rear 02 is brand new so I know its not that. idle's very smooth and runs great so I'm kinda at a loss here. Could it just be the cat going bad? Anyone else had this one come up?
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3rd alero- 02 GX 2.2 5sp coupe. drove for 3 years 55,000 miles. Sold for a kids first car, and missed
01 Intrigue GX
2016 Chevy SS, Jet Black
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