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My LX450 is also my daily driver, so I understand the need. I would be lying if I said I didn't have a spare ECU in one of my boxes-o-parts in my garage, not to mention a handful of other critical components that I have amassed over the course of ownership. While I wouldn't have replaced an ECU...

Yes. The ECU can be reset by pulling the 15 amp EFI MAIN fuse OR by removing either battery terminal OR by unplugging and removing the ECU itself. They all accomplish the exact same thing.