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This page from Land Rover has a good overview, apparently it's a new requirement in Europe (I've also never heard of it before):

http://www.landrover.co.uk/ownership/euro-6-emissions-standa...

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"A third warning indicates when 515 miles are left and also warns that the DEF tank needs re-filling or the vehicle will not be able re-start when the distance countdown reaches 0."

Wow.

"The engine will only start again when the DEF tank is re-filled."

And thus the the "faulty DEF sensor" malfunction is introduced into our car fault lexicon.

There's no limp mode?

A truck mechanic told me that drivers have been rumored to urinate in the DEF tank to bring the level of urea up to the point that it can be driven.

Well I suppose that's unintended comedy in the naming then.

Sounds like an urban legend. DEF is 325 g/L urea. Urine is roughly 9.3 g/L urea. Not a great substitute.

I think they're taking the piss.

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