How about I put the readings in the correct order and see if we still think they don't fit.

Cold, Open Loop, after startup: O2 = 4.28%, HC = 2785 ppm

Hot, Closed Loop, 2500, static: O2 = 0.08%, HC = 1039 ppm

Hot Closed Loop, Idle, static: O2 = 0.28%, HC ... Login to read more.