I'm sure this is the same as the one I get every now and then;
16814 - Catalyst System; Bank 2: Efficiency Below Threshold
P0430 - 35-10 - - - Intermittent
It brings on the engine management light. I've had it in at the garage and it's apparently a sensor after the cat to measure how efficient it is.
The garage said they see this on cars without genuine Audi replacement cats. The car just passed an MOT and the emissions were all fine.
I reset the error code and it generally doesn't re-appear for a month or two.
Hope this helps.
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