LQ4 with a PLX AFR mounted 30" or so downstream on bank 1. When I bought the PLX a month ago, i never bothered to see what it read on closed loop. I tuned the VE according to the AFR error, but now I'm thinking my wideband is off.
Anyone know why my AFR might be reading so lean? Could it be the wideband sensor, plx box, narrowbands?