The bulk of the Volvos you are working on today are pre-2014 and the times, they are a-changing.

Alternators have been charging vehicle batteries for many years, and charging systems have changed through the years as well. We will talk about one specific model, the Volvo XC90 V-8 engine type.

Whatever name you use for this problem, it all means the same thing — air leaking into the intake system behind the air mass sensor is not being properly measured and calculated for.