Seat Formentor hybrid warning light issues

I had similar symptoms with my BMW 3 series. The smoke during acceleration is concerning. I also experienced issues with vehicle emissions. Have you performed vehicle diagnostics to confirm the exhaust sensor issue?

Yes, vehicle diagnostics pointed specifically to the exhaust back pressure sensor. Was that the same for your BMW?

That's affirmative. The back pressure exhaust sensor was the culprit. I'd suggest replacement by a workshop unless you have experience with vehicle emissions systems.

I replaced the exhaust back pressure sensor. The error is resolved and DPF regeneration is working again. The cost was 245€ as expected. Thanks for the help.