He’s trying to fix this on the doner vehicle he is taking the engine out of. Why bother, it’s a huge waste of time.I’m not sure pulling the heads is the ri way to go. That’s not going to help identify why you’re losing fuel and/or spark or whatever.
You need to keep looking. Fuses, cam & crank sensors, sensor wires, multi-function unit etc etc.
The dealer can get the EKA code. I would call a different dealer. And if that doesn’t work, you can order a new fob that will come with a programmer and new EKA code.