J.R.

Sounds like a specialist in avoiding getting his hands dirty. The first thing I would have done would have been to pull forward the 7 pin (presumably) trailer socket and check the wiring connections for corrosion, wires pulled out etc. Trailer sockets have the same connections and (lack of) water protection as they did 50 years ago and are very prone to failure, VCDS would have been my very last resort, using my eyes and common sense would have been the first. I do also have a plug in tester because trying other lighting boards can introduce myriad other errors as you have found, there is only one thing more shonky than a trailer socket & plug and that is trailer light units! I cant believe you have to have 2 appointments with a "specialist" to resolve such a basic issue.

Did you recently add or recode the steering wheel sensor? If so then in doing so it has removed the other modules, that the sort of story that I had heard about OBD11. Good luck with reinstating them, I hope you have a copy of what the long coding was before.

Something changed the door modules were removed from the installation list 🤣 I doubt that it was responsable but it was a daft thing to have been persuaded to do. Using VCDS I can add or remove modules from the Gateway installation list, I did it with the Bluetooth module which I had disconnected after not being able to stop messages appearing about previous owners phones, it was then showing a non comms error code so by programming I told the vehicle that it no longer had the module. I doubt that you can do it with OBD 11 although I have heard that sometimes it will do things like this when making other changes, in VCDS it is adding or removing modules from the gateway installation list and I think it is done through long coding of the Canbus Control Module (editted, it might have been Central electrics controller) but my memory may be incorrect.

To answer your question, and this is only speculation on my part, its trying to do a regen all the time because it hasn't been able to complete the previous ones, 8.71 grammes is probably above the regen completed threshold, you will find what it is amongst the millions of VCDS measuring blocks, 3 grammes rings a bell for my engine. I have moved to a new area and my journey profiles have changed, before having the emissions fix rolled back 20km journeys locally on windy slow back roads were sufficient to get a regen started but never to complete, the fans were running pretty much every time I stopped day after day and I would have to go for a thrash just to allow one to complete, that was bad enough but the frequency was so often I would be driving the car as much to please it as to please myself, the final straw was doing an 800km autoroute journey towing a massively overloaded trailer with a huge frontal area, i was on full throttle on every slight incline and the oil temp was sitting at 116°c, if that did not achieve a passive regen then nothing would but the day after I arrived it was trying once again to regen, calculated value 23g, measured value 0.5g It had actually regenned during the drive down several times as well! That was the final straw, I had the ECU software rolled back and I hear the fans running after switch off maybe once every 3 months and then only after lots of short journeys, its still regenning more than the measured values would require but nowhere near like before.

Tha fact that your measured value is significantly higher than the calculated (or even higher at all) is a cause for concern, the diff press sensor is indicating that the DPF is obstructed, it may be a sensor failure or one having been replaced and not calibrated but I would not expect the measured value to exceed tha wildly pessimistic calculated one. I would check how many kms since the last regen, beware it expresses the value in metres! Typical of the rubbish put out by VCDS, I dont know if its them or VAG to blame but you simply cannot trust many of the units or their +ve & -ve values. I would keep an eye on the readings and see how quickly it rises and also test the diff press sensor reading at idle and the max 2.5k RPM you can do at a standstill, if you have a passenger who wont get carsick looking at the laptop screen then check it while driving.

Yes, that may have been a wrong assumption on my part, it might be only diesels with their inertial acceleration/decelerations each revolution that require one.

Where and how are you taking the curret drain measurements? After how much standing time? Are you fooling the vehicle into thinking that the door or bonnet is closed? Try refitting your original radio, my bet is the current drain will no longer be there, if so then the reason is disconnecting your new Android one does not allow the shut down signal (which it isn't sending anyway) to be sent via the Canbus telling the other modules that they can go into sleep mode, you would need to recode the installation list to say that no radio is fitted or it will be always looking for it.

As long as every time I check using VCDS I find that the measured soot is far less than the calculated then I am a happy anxiety free bunny! Having had the "fix" rolled back I am no longer concerned about the fuel wasted and the possibility of oil dilution from what were far too frequent regens, even now only one in three that happens should happen but they seem to complete in the same driving cycles where before they would not and try again each and every subsequent journey until I did a similar distance but on faster roads.

It didn't, I was simply answering the question. I don't know for sure that when an ECU has calculated that a DPF has 80g of oil ash but the differential pressure is fine and dandy that it will actually say game over and go into limp mode but I did not want to find out. Call it anxiety if you like but I dont want to undertake a long journey at a higher mileage and be concerned about "Computer says NO!"

These things get lost or overlooked, when towing often the luggage compartment is full so when the swan neck is removed it might be put in the shed, garage etc.

Its probably one standard wheel liner for all the accessories some of which may not be supplied dependant on the spec of the vehicle or in its country of origin.

You can tell the ECU that the unit has been replaced and it will then start counting up from zero again, if like me your measured vs calculated readings are drastically different then there is no harm in doing the reset, I have. I know now that when the ECU finally says "No more!" it will be from having measured the back pressure (differentiel) and knows the DPF is blocked rather than based on a very flawed calculation. I also paid to have the Emissions Fix rolled back, the rate at which the calculated soot mass rises is much slower although still far more than the measured, it's very very rare indeed that I am aware of a regen these days, before it was all the time.

Alternator pulley oen way sprag clutch is a common source of terminal sounding noises, it's easy to diagnose and ou dont need to remove the belt to do so, - if the longest run of the serpentine belt oscillates back and forth a visible amount then the clutch is foutu, an easy job to replace.

I replied to your message and am repeating it here for the forum. I have a different vehicle & engine but the EGR position is probably similar because I could not see the connector either, I traced the loom to it and removed it by feel, by the time you get your arm down there you could not see anything anyway. Having now done it a couple of times its become easy but releasing the latch on the connector whilst pushing the connector in and then pulling it out while keeping the latch disengaged all with one hand and by feel takes a lot of doing, I fed a long screwdriver down by feel into the right position to release the latch and used my other hand to push it. If you think about the positioning of the unit and how you run the sub loom to the MAF sensor the whole installation can be completely invisible, you would have to be on the look-out for modifications and then remove the air trunking to see that mine has been fiddled with, they use an identical piece of loom and connector for the MAF sensor which is the only visible part.

In his imagination!

It should never have been registered with the DVLA without a certificate of conformity, the dealer should not have sold it at auction either but we are talking about the motor trade here. Whether you feel you have anything to gain by contacting the DVLA and letting them know I don't know, it's a shame it could not have been done before they shifted it via the auction.

It doesn't, quite the opposite in fact.

Get away from your phone/keyboard and try it!

You can lead a horse to water.....................

Why do you think there was such a need to create low SAPS oils if combusted engine oil has a negligable effect on a DPF? Its like me saying that 1mg of arsenic is nothing compared to the 2000g of water I drink a day.

No doubt the OP had unwittingly switched back to that mode after looking at another parameter.

I know, it was my humour. Vous me prenez pour un Américain hein!

Are you an American? I had one at my Apparthotel in the frozen North complaining that there wasn't an ice machine on his floor, I said that's because there isn't one on any floor sir! He then asked where he could go to buy some ice, I was tempted to say Antartica but refrained, I had never seen it for sale and still havn't, Paris perhaps? Another said that the airconditioning which we dont have was not working, he had turned the thermostat down and it was no cooler, I explained that it was the thermostat for the underfloor heating and far from turning it down he had set it to 40°c managing to break the stop intended to prevent people switching it over a safe temperature, he may have thought it was Fahrenheit and wanted to make his own ice 😆

The obvious thing to say to yourself and your friend would have been, "my foglights were not switched on!" With so many unnecessary automatic systems on modern virtually self driving vehicles many people think that everything happens automatically and expect a warning light for everything.

The new rear brake pads will not have contributed anything to an emergency stop, indeed having not yet bedded in they may have even increased your stopping distance, I doubt it though, the rear brakes do very little aside from when commanded by the stability control systems.