I tried to do the quest yesterday but you need a Herbie Suit and I lost the code for it so now i'm stuck. I'm really sad and was wondering if there is any other way to do it?
It has links to spoilers that will get you through the quests.
You don't really need a Herbie Suit to do the quest, but you do need to do the Diver quest first. Mal's excellent guide has all the info you could want
The helmet is part of the diving quest magic, you need to complete the diving quest first before doing the driving quest. It's quite a common mistake that a lot of players make, starting the autopia quest first and then finding they can't do it with no diving magic.
Anyway, get to the Captains quest quarters, and get the diving quest from the desk thing , finish that and you should be all set for the driving quest
I thought the same thing for the quest but I did not need it. I think they gave you misleading information unless they changed the quest a tad and you have to have it.
Yes , you need it as one of the tasks requires you to go under water to pick up an item...so you MUST do the diving quest before the autopia driving. Hope this helps!