Thanks Carl, now I just have to wait for it to arrive :)

Is there an alternative diagnostic kit I can use to reset air suspension and get fault codes for a 2003 L322 ??

That is a con - I can’t even find them second hand , none on eBay.

I have just bought a Hawkeye total - looks like a great piece of kit but completely useless as I don’t have this red dongle either and it looks as though it’s now obsolete!