DIY - Changed pre-cat O2 sensors after CEL, now no codes, but car sluggish

[eswaroop]

So I recently changed out both my pre cat sensors (Bosch 17039) as one of them was giving me an CEL light - ended up swapping both by accident actually as I swapped the wrong side first, but I figured it was eventually needed.

Car has 58k miles. Used to drive great before, even with the CEL lgiht on, now its a bit sluggish. Noticed its a lot slower to warm up as well..

Mileage has dropped a bit (17 MPG mix vs 18.5 before) - I know sometimes the sensors take a bit to re-calibrate but its been almost 2 tanks worth of gas through it now.

Any ideas? I could try to swap the good one back in but its a pain..

[eswaroop]

No ideas?

[arucano]

how much have you driven since the change? You can clear the adaptation and see if that helps. alternatively, your cats might have plugged up a bit in which case you should try an Italian tuneup (a high speed full load blast or two...)