Well the ugly Check Engine Light came on again. It came on for about a week a year ago, got it checked and it was the PO420 code.. "Catalyst System Efficiency Below Threshold (Bank 1)." After a few days it shut off, so I didnt think much of it. Now it came back on a few weeks ago, same code, and isnt going off. The guy at Autozone says its my O2 Sensor. Makes sense cause ive been getting crap gas mileage.
Could it be the O2 sensor? The car has a Bassani Hi Flow pipe on it. Im alittle confused.. I dont know if my Cat is bad, the O2 sensor is bad, or if its just one of those common things. Any opinions?
Thanks,
-Franklin '96 Cobra