1996 Holden Commodore engine check light

Can be anything-you will need to have the computer scan for codes to determine what's causing it to come on-start here

Your most common engine codes are evaporative emissions system leaks. Basically your fuel take is pressurized and the system detects a small leak. This wont cause the car to run funny but your fuel economy may decrease. I'm willing to bet thats what it is if your not noticing a problem in performance. Go to an auto parts store like Autozone and have them read the code for free. If it is a bad sensor the can cross reference it with a part number. They can also delete the code for you however it will most likely pop right back on if you don't solve the problem. If it is the fuel tank vent leak theyl probably tell you to replace your gas cap, one thing you can try is making sue you hear you fuel cap click 3 times to be sure it had a good seal. Give that a shot