Tucson Diesel injector problem

I've got a Tucson too (not sure about the year), and I remember seeing something similar. Drift compensation, as I understand it, is the ECU trying to fine-tune the fuel delivery. Could be airflow sensors giving bad readings, messing with the fuel trim. Have you checked for air leaks or tried cleaning the MAF (Mass Airflow) sensor? It's usually right after the air filter box.

Thanks! Regarding airflow sensors and leaks, what specific diagnostic procedures or signs should I look for? Is there a specific range the MAF sensor should be outputting?

I'm no expert, but for leaks, listen carefully when the engine's running, especially around hoses and intake connections. A hissing sound is a giveaway. As for the MAF, I'd just try cleaning it first with MAF sensor cleaner (specific stuff, don't use anything else!). If that doesn't fix it, then maybe look into live data with an OBD scanner while the engine's running; but if you aren't experienced with that, this reset quantity drift compensation error could be something for the shop.

A workshop visit was indeed needed. The diagnosis confirmed a defective injector, leading to a replacement costing 515€. The engine now runs smoothly, and the error is resolved. Thanks again!