O2 sensor issues with LT headers?

I have been running Speed Engineering LT headers with a Blackbear tune for a couple months and a couple days ago the CEL came on. Checked the codes and it's showing issues with the position 1 O2 sensors on both bank 1 and bank 2. I think I'm at around 107k miles and I bought it used at around 30k. I haven't changed the sensors since I've owned it and I can't imagine they were changed before then, so it's entirely possible that there's nothing more to it that swapping them out. I just want to see if anyone has any recommendations for higher quality sensors so use or any other issues that might be causing/contributing to their failure. Thanks!

i would stick with delco o2's. oem sensors work best generally.

RockAuto

ACDelco or Bosch sensors imo.

I thought Denso was OEM? Or is that a NNBS thing?

iamdub said:

I thought Denso was OEM? Or is that a NNBS thing?

Click to expand...

AC Delco O2 sensors are original equipment on NBS and NNBS.

Frustrating update to this post... I swapped out both sensors the other day, cleared the codes, and the light came back on almost immediately after driving. I cleared the codes again, flashed the stock ECM and TCM files back to the car, the check engine light came back on within a couple minutes. Clear the codes again, reflashed the blackbear modified tunes and same thing, the light came back on within a couple minutes. Anybody have any other ideas?

Error codes currently showing
ECM:
P0030
P0050
P0053
P0059
P0135
P0155

Blackout7c said:

Frustrating update to this post... I swapped out both sensors the other day, cleared the codes, and the light came back on almost immediately after driving. I cleared the codes again, flashed the stock ECM and TCM files back to the car, the check engine light came back on within a couple minutes. Clear the codes again, reflashed the blackbear modified tunes and same thing, the light came back on within a couple minutes. Anybody have any other ideas?

Error codes currently showing
ECM:
P0030
P0050
P0053
P0059
P0135
P0155

Click to expand...

What brand sensors did you use? Are you running cats and if so what brand/ how many miles on them?

Rocket Man said:

What brand sensors did you use? Are you running cats and if so what brand/ how many miles on them?

Click to expand...

AC Delco sensors. I have the speed engineering longtube headers to the off road Y, then stock setup from there back except I replaced muffler for a borla one

Blackout7c said:

AC Delco sensors. I have the speed engineering longtube headers to the off road Y, then stock setup from there back except I replaced muffler for a borla one

Click to expand...

So no cats ? I take it you have the downstream O2 sensors tuned out? You should contact Blackbear. They can take a look at a data log and see what’s going on. Justin is a smart mofo. I would be looking for a burned or melted wiring harness next to the headers or y-pipe while you wait to hear back from them. Hey @BlackBearPerf are you there?