You are correct, my ‘19 for sure did not have any sensor like that, though the later models do have one more sensor on the dpf unit according to the calibration. Hence the extra lines in the calibration.
Being that this new sensor is fitted after the scr unit as well, would definitely indicate they have some concerns on the earlier models not meeting a certain standard of particulate removal from the exhaust stream….
Interestingly, there are new calibrations for all model years out there now on the tech info site, so they obviously have some more parameters in there as far monitoring particulate output goes. They won’t be of much use to us as far as being deleted, but it would be interesting to know what extra they’ve added and how they are monitoring it on the 18-19 without any additional hardware.
I don’t have access to mine currently, stored in a different location to home, so I can’t get any pictures of what sensors are on the cans themselves, but there was definitely no sensor in the same spot on my 19 when it was removed….
You are, however, very correct in saying that they surely can’t justify fitting a sensor, then tell you your aftertreatment system is not working correctly and must be replaced, as you’ve said, especially with low mileage units having issues, it points towards a manufacturing flaw, unless that was their angle all along, to try and recover some of their costs

