Any reason this would come up, or could be related to an EGR sandwich plate install? Standard stuff there, disconnected the UICP, battery, installed the plate, and reassembled, and now the wideband only shows stoich - regardless of being in gas/boost (rich), coasting in gear (lean), and everything in between. It's an autometer pro-comp ultra lite, worked for years before this with no issue, no drama.

 

bad sensor?

 

sensor disconnected at some point dring the autox, weird