[hypoxia]

The only commonality to speak of is when we had the transmission replaced the Doser was disconnected, I think. Always go to the last thing touched. I'm not sure if the heaters are affected by that. All three go through the same fuse and relay (new) to the filter assembly. I'm considering a new wire run as an experiment, it could take a year or so to validate but should be easy. Grrrr