03 LeSabre O2 Sensor.
 

Need Help locating the Bank 2 Sensor 1 O2 Sensor in my 03 LeSabre. Have spent about 3 hours on Google and haven't found anything Super Helpful.
Go In from the Top or From Underneath? Only info I could find is that the sensor should be between the Rear Cylinder Bank and the Joint where the Exhaust from the front and rear meet.

That's a tough one. If it's a transversal V6, it does probably have a sensor for each bank then (4 cylinder's single) and it would be accessible by putting front up on ramps? Don't know Buicks well, our first is a '16 LaCrosse. Doubt this is exact and of a '16 LaCrosse model, crazy exhaust...... But it's way quiet, very desirable for a "6". Not like my Boss 302 with unmuffled sidepipes (legal) lol.