Should be just up and downstream
Curious to know how this goes. I just picked up a "new" 2007 after the rust on my 2005 at 260k became too much to bare. It threw this same CEL and I've read that it's a bitch to really iron out.
Have you done a freeze frame check or watched the data coming in from that sensor to make sure the issue really is the O2 sensor?
I have Torque Pro and set a gauge for that bank and the data flows fine. Though, our cars may never have had these sensors replaced so maybe replacing them is the right thing to do especially since, I'm told, it's a pretty dang easy repair.
BUMPSup guys, how's it going? On my '07 2.3L, I got a p0138 error code for O2 Oxygen Sensor Circuit High (Bank1Sensor2). Kinda makes sense now cause my gas mileage was declining quite noticeably and I couldn't figure out why.
But before I order new ones I want to clarify some stuff. I see people saying to replace the sensors in pairs. Does that mean I order an upstream and downstream one and I'm set? Or are there more than two o2 sensors. Thanks a ton, sorry if it's a dumb question. I appreciate any help, cheers