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The electric handbrake (electro-mechanical handbrake or EPB) to give it it's correct name is usually pretty robust. You'll probably need to scan the car to see what error logs are there. My wife has a BMW i3 and she had similar issue, however I traced that to the physical switch. Does the handbrake button illuminate, but no handbrake? Usually you need VCDS if you're swapping rear pads for example, to place in the service position. There are some YouTube hacks including 12v power-supply, but I would avoid unless you want further issues. Speaking of batteries, you can get issues with a failing battery too. If it's old - then consider swapping it out. A new one needs coded to the car. Check the fuse too. You can get VCDS from Gendan for around £200 and find an old laptop to run it on. Best money you'll every spend.

Hi Spartacus, yes I bought a new oil level sensor from a reputable retailer. After it was fitted, I took the car for a test drive, I should mention at this point, that my mechanic thought it was an oil pressure sensor, despite all the info messages. Anyway, as soon as the test started, the same fault lights illuminated. I drove back the garage where the mechanic stood with a new oil pressure sensor in hand and a smug grin on his face. Turns out he was right all along and the fault has never returned.

1st it means what it says! There is a countdown and at 0 the engine will close down. 2nd the problem is vv likely the failure of the AdBlue pump and that really ps me off as 1 it is the result of Audi using an inadequate/poorly made pump, and, even worse, installing it inside the AdBlue tank so that it cannot economically be repaired or replaced. You need a new tank and associated electronics. When the new part is fitted, it has to be registered to the system. Some people, esp in US, say the solution is to ditch AdBlue. That's forbidden in UK and will show up as an MoT fault.