Oxegen Sensor locations?
 

I recently got a CE light on my 96 C280, its the oxygen sensor but I am wondering where is "Bank 2 #1"? For future referance where is Bank 1? Is there a #2 on Bank 2? The car has 173K on it now, should I just replace both? Presuming there are only two. Last but not least, will I need a special tool?

Thanks,
Brad

Oxygen Sensor
 

2001 E320 44k
Go To Any Auto Supply Ask For Import Oxygen Sensor Tool, The Sensors Are On Output Of Exh Pipe And Two Rear Of cat , GO TO THIS SITE OR PERFORMANCEPRODUCTS4BENZ.COM 1996 C280
FRONT OF CAT IS $167.00 AFTER CAT IS $163.00 1-800-243-1220