WHY is this happening :

For future reference, a more helpful title would be something like "Door, wheels missing on car mod - why?", and more helpful post something like "On this car mod (video), the left rear door isn't showing up, and a few of the wheels aren't showing either. The car still drives normally. Any idea what the issue is?" It's best not to make people click a link to a Youtube video to view your problem.

My only guess would be that there's something wrong with the vehicle model, and that should be obvious in itself. If you didn't create the model, then whoever did needs to fix it. 

I made it it looked fine in zmod

I just need help fixing it

Use the edit button to add more information to a post -Staff

Edited August 6, 201411 yr by ineseri

I made it it looked fine in zmod

I just need help fixing it

Use the edit button to add more information to a post -Staff

I know a team of modelers who could possibly fix this. PM me if your interested. We'd have to get more involved. Possibly a teamspeak or skype call. PM me for more info

Why not post the solution here instead of keeping it within your group? 

I believe the model is corrupted. 

The last time I had something happen to my model where wheels and doors disappeared, there was an issue where either the model was corrupted by something I did or the model was too high poly. Try locking it, which requires re-exporting, and sending it to someone you trust so they can test it in-game. If they get the issue too then it is most likely something with the model, I would slowly add parts back to your creation until you run into problems. Try this all out and let us know about the results.