Looks the bollox that,I'm sure I downloaded that trial app before and it was really good,only gave you speed and g I believe as it was just powered from the I phone itself.

The obd2 scanners are essential in this day and age.I've got a mac tools one,only a £90 jobbie but it's awesome.amazingly the only car it wouldn't hook upto was my Corsa 98 model,the only one you can't do the paperclip test on either!!!