Engine Management Light on and DSG not matching revs
I'm new to the forum - I was hoping my first post wouldn't be about a problem with my car, but it looks like the gremlins had other ideas.
I've bought an '08 A3 170 TDI S-line with the DSG gearbox and 30k on the clock about two months ago. We've been getting along fine until this morning when the engine management light came on. I've booked it in with Audi for them to take a look at, and since the car still seemed to be driving fine I wasn't too worried that they couldn't fit me in until next Thursday.
Anyway, I got a couple of slightly clonky up change changes on the way home from work with the gearbox in D, so I tried a few shifts up and down with the paddles (whilst still in D). It's not blipping the throttle when you change down and doesn't seem to be matching the revs very well when you change up.
I tried driving along at a steady 50 mph in 5th and then clicking down on the paddle - the revs drop all the way to idle and then it engages 4th!
I've not got VAGCOM, but I've got a couple of gadgets that will read DTCs. They both show a single fault code - P0473, which according to Google is to be 'Exhaust Pressure Sensor High'.
I'm now a bit confused - either I have the wrong description for the fault code, two different problems or they are somehow related!
Has anyone had similar problems or know what might be wrong? I'm a little worried now that I've got some kind of fault with the dreaded mechatronics unit rather than just a dodgy sensor:(