I have a 1998 V70 with the base non-turbo engine. Can anyone post me a diagram for the locations of the O2 sensors? Is the a DIY job or do I need a lift in order to access the sensors. My mechanic is quoting $100 per sensor to replace them and Ijust can't see how it would take an hour per unit to replace them.

 

They are under the car.
One is before the Cat converter and one is behind the cat.
You can use a jack and jackstands then get under the car.
Then plugs are a pain to get to as well.