Well, on my partner’s car happened the same issue (Kia Sportage diesel, 2018 and currently under 20k miles on the clock).
While she was driving, the light came on (in yellow). She took it to a garage and they mentioned the DPF cleaning.
I’ve made the drive for 30miles at an average of 3000rpm (60mph in 4th gear) and the light persists.
At the garage they already change a sensor (the temperature one I think) and the light is still there. ?
Then I used my OBD reader ( caught a few codes related) and tried to clear the DTC’s but after a few seconds the infamous light came again.
So I’m afraid that I have to change some other parts.
Now I’m thinking on the “particulate matter sensor” prior to consider the actual “particulate filter” just because of the price and labor (while the “missus” already wants the car gone… ?)
The funny part is that is relating to glow plugs in one of the cylinders…
Any suggestions or a different approach on this matter would be highly regarded.
Many thanks.
R.