Just an update to this. When i first got the car i bought a full size (secondhand) alloy for a spare wheel.I had a tyre put on and didn't notice at the time but the wheel didn't have a TPMS valve in it. A couple of months ago at it's MOT i got an advisory that the rear tyres were splitting between the treads. Instead of buying 2 new rear tyres i put the spare on one side and got a new identical tyre on the other. Every time the car had a fast run the TPMS warning light would appear on the dash, presumably when the tyres were hot. I cleared the codes several times after having checked the pressures and eventually realised it was because the one wheel had no TPMS valve on it. Strange as it may sound this has coincided with the extra soot build up and more frequent regens. With no TPMS warning light on the soot accumulates as normal as is fuel consumption. Why this happened i've no idea but i've now had the tyres swapped over so there are TPMS valves on all 4 road wheels.

I`m having exactly same issue.

Last few regen its logged as fail and its keep regenerating around every 80 miles.

It does fail even doing 70 and over on motorway on long journey. Few months ago I replaces dpf pressure sensor (genuine from kia) as I had oil level increasing and thats when I started to drive with obde scanner connected to the app on mobile. I suspect it might be linked to stuck EGR Valve or faulty glow plug as they very important for proper regeneration. Last few regen DPF soot mass when reaching around 3 grams its jumps straight to 0 and thats terminate regen. Soon after Value showing around 1.2grams Only yesterday and today have done around 200 miles mostly on the motorway but my Sportage decided to start regen when i heavy traffic . Than Again on motorway but it did fail as well. If you manage to found a cause please let me know.

Mine is 2016 new shape Sportage 1.7 diesel

Hello Ronald, I joined the forum just now specifically to to relate my experiences with this issue. I have a Sportage 2.0 185bhp awd iv ql 2017. Last summer the ECU started bringing on the DPF light, fault code P2003 followed by the MIL light at the next fail cycle. Not a lot of fun when towing a caravan. After Green Flag reset the lights I spoke to 4 Kia service departments and 2 of them supposedly looked at it and found no fault. A local DPF specialist fitted a new differential pressure sensor - no more lights for 8 months! Recently it all kicked off again. My OBD2 reader showed pretty much exactly the same numbers as yours, soot filling up rapidly to 13-15g, ash at 300-400mg, no passive regen then active regen with exhaust temp over 800°C! soot dropped to 3g, stuck in traffic then suddenly zero. On return journey rapid soot build up again. I then bought Infocar with the £7.99 Kia specific extension. DPF pressure showing minus 13. Fitted another pressure sensor and from cold readings rose rapidly from 3.2g to 8.3g and stabilised for 50 miles. Next day readings stable from cold, ash readings rising very slowly. Still not sure whether completely solved, off for diagnostics on Friday. The new sensor might need calibrating? Hope this helps, why do we have to learn all this stuff?

So your car has done 27,000 miles in 6 years. I'd say you should've done at least double that in that time. That's probably what your problem is. Firstly your DPF will passively regenerate. This is where the filter gets sufficiently hot during driving to break down the particulate matter allowing it to pass through. Most of your regeneration will be done this way. If that's not possible then the system will go into an active regeneration. If yours keeps regenerating then you probably aren't doing the kind of mileage and driving conditions to enable a suitable passive regeneration. In this case you'd probably be more suited to a petrol engine car rather than a diesel. Modern diesels are not intended for short journeys. You'll create yourself very expensive problems if that's what you're doing.