Since I so seldom purchase them, and since when I do it is because one of my customers is either visiting colder climates, or moving to colder climates, and I rather not have them run into any problems when I'm not readily accessible, I purchase the Volvo ones. Other folks on this board can probably answer your question better since I'm certain many live in a land of ice and snow, and may well have purchased an aftermarket one.

Yes, it is possible that your air mass meter is cooked, and the only reason I would be leaning this way is because you have a code for it. There are two other components that are greatly affected by heat, and they would be the coolant temp sensor, and the heated 02 sensor. Next time this happens, unplug the 02 sensor and see if the problem lessens. You can't unplug the ECT, but you can check resistances. Anyhow, hope this helps.

Chris