Hi guys, I'll loan a ODBII code reader soon to read the fault code...Meanwhile, here're what I have done to the truck in the last few days - dont know if it's a coincidence or not: . OME851/860 springs installed (upgraded from OME861/862) with new Bilstein shock absorbers - I did not encounter anything unusual when swapping out the springs; this was about a hundred (100) miles before the CE light came on. . The original Panasonic battery went dead after almost 8 years - had known it was coming (showing signs the week before) but I gamed instead - new Interstate MTP-24F battery installed 50 miles ago. . New Bridgestone LT285/75/R16 AT Revos installed 30 miles ago. Anything I should check in the mean time? The truck runs and drives fine regarless. Inputs are greatly appreciated! Thanks in advance, Frank.