S70 map sensor?

I have a service code of P0107 and the check engine light is on.

Poor gas mileage lately (18 - 19 mpg) but car is running "ok".

I hear it relates to the "map sensor"? fuel/air mixture?

What are the common problem(s) associated with this?

Is a new sensor required or something else......(generally).

Thanks so much for any help.