2006 Volvo XC90 V8 : Oxygen Sensor

[JohamB83]

Hello Everyone,

check engine light come out and when to mechanic to check. The Scanner showed that the Oxygen Sensor Bank 1: Sensor 1 and 2 are no longer working.
could someone tell me where are they located and what should I do to find out that it is the Oxygen sensor the problem in order to confirm.

thanks

Joham