C6 rough running error code

I had something similar happen with my old Volvo V70. Check engine light, rough idle. It wasn't exactly 'drift compensation', but it was fuel injection related. Did you check your airflow sensors? Those can throw off the fuel mixture.

What specific error codes did you get with your Volvo, and what troubleshooting did you do? I've been focusing on the injectors, but I'll check the airflow sensors too.

Honestly, I don't remember the exact codes anymore. It was a while ago. I cleaned the airflow sensor a bit, but the problem kept coming back. I ended up taking it to a workshop. They replaced an injector.

My initial thought was right. I took it to a workshop, and they confirmed a faulty injector. Replacement and reset of the quantity drift compensation cost 515€. Thanks for sharing your experience.