Bad news mate, my 06 VE Omega had the same issue about 10 months ago. Initially, it was just the check engine light and nothing else, didn't think anything of it so drove it for months without issue, only major problem was starting it on extremely hot days. Fast forward to today and the car is currently sitting at my local Holden Service Center, I have been quoted 3.5k to get the engine fixed for the timing issues, software updates, etc. Hope this helps you!