I bought my evo with a aem standalone and switched to stock ecu recently, and am getting to o2 sensor codes and really weird lean conditions at idle and cruise. It wouldnt work at all at first in closed loop cause the plug is cut off the harness and i had to hard wire the o2 sensor to the cars harness, still not sure if my wiring is 100 percent correct but theres no info for this anywhere it seems like. Any info would be awesome on this, oh and its an oem denso o2 sensor not a cheapo.