Have an aussie ps3 trying 2 play dvd and it says region code incorrect how do i fix this

PS3 can play games from any regions, but it is limited in playing discs from different regions. You can try some region free players on your pc that can enable you to play discs from any regions. You can try Leawo Blu-ray Player which is a free Blu-ray/DVD player and a region free player.

Just rip the Blu-ray/DVD disc you want to play on PS3 to MP4 so that you can put it in a USB drive and play it with PS3 using the bulit-in video player. Check out how to rip Blu-ray/DVD to MP4 here: How to Rip and Convert Blu ray to MP4 with Blu ray to MP4 Converter

The PS3s' DVD and Blu-Ray player is region locked. This means that your Australian PS3 can only play DVD and Blu-Ray movies made for the region Australia is in or are region free (region code 0).

For DVD's, Australia is region code 4.
For Blu-Ray, Australia is region code B or region code 2.

Although this doesn't help your current problem, the PS3 is region free for PS3 games (you can play games from any region).

To work around this, I propose either ripping the DVD to your computer, then burning it onto a different DVD or streaming the DVD directly from your computer to the PS3. Streaming is definitely the better bet if you have more DVD's from another region.

To rip and burn your own copy, use a blank DVD disc and DVD burning/ripping software such as Nero.

To stream to your PS3, check out the following:
PS3 Media Server (my personal favorite) for PC
TVersity for PC
MediaLink for Mac

Enjoy your movie (hopefully)!