I've seen several posts about replacement O2 sensors, benefits thereof, etc. I had the CEL and all that, diagnosed as O2 sensor. 277K miles, never replaced before now. They wanted my first born for the Honda part. Autozone, got the Bosch, installed. Fixed the problem, got great gas mileage at first, probably first couple of tanks. Now gas mileage has "tanked" and the car feels sluggish sometimes. Still very driveable and no CEL yet, but something ain't right. Any ideas? Am I due for the Honda part?

:wtf: