As an update for the above...when I first told them I had a DSG service they told me you should never change the oil on the DSG as it can clean all the crap off the old components causing damage.
The fault code didn't come up when they plugged it in and they are not convinced it is the speed sensor. They also said a basic reset could work but may not. Failing this they would recondition the valve body on the mechatronic unit.
Looks like I got some thinking to do!
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Well after them saying you should never change the oil you should avoid them like the plague.
I knew they would say it's the mechatronic unit as one garage told me that without even looking at the car. Just such an easy thing to blame. And replacing that at a hefty cost from a "guess" would be a costly error.
And if the code wasn't there when they scanned it maybe it's an intermittent fault and has cleared. The faults have something called a reset counter which means each time the fault doesn't occur it clears back down to zero from a max of 255.
Keep an eye on it and maybe get a local user to scan in a few days to see if the code comes back.