Probable cause
?? Connector contact defect ?? Engine controller defect
?? Engine controller harness defect ?? Multifunction display defect
?? Multifunction display harness defect ?? SAS/OPS controller defect
?? Fuse defect
Caution:
When the controller or optional display is replaced into another vehicle with different specifications, AD-1
and AD-7 may occur. In such cases, perform "Engine and display ECU information clear".
Error codes AD-1, AD-2, AD-7, AD-8

Disconnect the negative terminal of the battery NG
and inspect the fuses.
OK
Fuse defect
No error
Disconnect the battery negative terminal (for
more than 10 seconds), after inspecting and
correcting disconnection and water entry of A20,
A21, G38, G39, AQ1, AG2 and Q2, reconnect all
connectors and the battery negative terminal,
turn the ignition key switch ON and check
whether or not there is an error.*
Error
Connector contact defect
Inspection 1: NG
Harness continuity and short circuit inspection
OK
Harness defect
Engine controller defect (AD-1)
Multifunction display defect (AD-7)
SAS/OPS controller defect (AD-8)
SAS/OPS controller or
engine controller defect (AD-2)

Good day I had the same problem not to long ago and had to replace the XSE box above the valve bank. I hope u find this useful

I am having the same problem on mine what did you do to fix it?

I read your post why did the dealer change the ecu the code deals with sas/ops controller AD-8 communication problem bad harness water in connectors or defective ops/sas controller
-Ad-2 deals with ecu problem