the computer's in behind that plastic panel in front of the passenger door - that's what the two plugs in it are for, access to the LED error code display and the selector screw.
How big's the box you're talking about, because the engine computer's about the size of a CD ROM drive.
been out and looked at my car - it's about the size of a deck of cards, yeah? with 6 wires out of it. Not sure... will look at the wiring diagram
Yeah that's it, it's well sealed too, love to see what's in it, with my luck it would self destruct if i opened it

The error code doodah is not always truthful i've been told ?