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Great news you've got this sorted. What is the part number for the sensor? Do you have a photo of it's location? It would be really helpful should anyone else have the same issue.

Hi all. Just thought I'd say hello. I used to hang out here a while ago as an A6 owner. Today I took a bit of a mad turn and traded in my Range Rover for an ex-demonstrator A8, it's a 68 plate with just 13k on the clock. I don't get it till Friday but yeah, even at my age, you can get excited about a new car. 🙂

Thanks buddy, replaced a sensor (left hand - pre dpf) with a cheap 20 quid knock off (next day amazon) but still threw a code, might be frowned up but I flushed through a 1000ml of partially diluted (RO water) Dawn oven cleaner through the dpf via left hand side pressure regulator pipe with engine running as I didn't want backwash into the cylinders. Used one of those cheap hand pump garden sprays and MacGyver jerry-rigged tubes. Lots of smoke came out the back >< anyway, dpf pressure went down loads (4mbars when it was 16mbars) swapped the sensors round, told the car I had just replaced the dpf and to train the sensors via a Launch CRP129x (bought for this job) Long story short- did a 100mile round trip on the motorway and it didn't throw any codes so I presume it' can regen now. I'm fairly certain the garage swapped the egr cooler when it was the sensor at fault, and it had been driven for quite some time leading to the dpf being blocked, a combo of new (egr side) differential sensor and a really harsh dpf clean sorted the problem out. Thanks for your help bud 🙂

Hi it is an aftermarket part, gaskets don't seem to be listed anywhere for the oil pump that I can see, I will give audi parts dept a try and update with the outcome Thanks