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Also, I had a peek in the fuse box, at the relays the dealer's mechanic was talking about. The EFI relay has "horn" written on it w/ a sharpie, and the horn relay has "EFI 1" written on it. I guess they diagnosed a problem with the EFI relay and swapped it with the identical horn relay to see if that would help (having labeled the originals), and it did at the time.
Could there be some kind of voltage fluctuations (due to another burned off ground somewhere?) that would be frying the EFI relay? I guess I should check my horn to see whether it still works w/ the original EFI relay in place. Will do that tomorrow.
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