Looks like I spoke too soon – there’s an application that drives the Kiwi ODBII hardware module available for the iPhone as well. It’s called “Rev”, costs $39.99, and uses WiFi to connect. It was last updated on January 4th, 2010, which is somewhat worrying, but the price of the app is a lot lower than the price of an Android device, so it means a huge savings to me. If I ever put the hammer down and get it.