@SteveH posted:It's not unheard of for a 5 year old EPROM to have a failed/corrupt data block.
Well, that seems to be a bit of a stretch to me, the chances of it simply inhibiting sending the engine data and yet all other functions working through the same sensor and code is pretty unlikely in my experience. While it's not impossible, I'd be pretty amazed if that was actually the issue. FWIW, it's FLASH, not EPROM.