02 Sensor?

I have a fault code of P0133: 02 Sensor Circuit Slow Response (Bank 11 02 Sensor 1). I would like to replace this sensor myself, but how do I know which sensor it is and where would it be located? I'm told there are 4 of them on my 96 Ram 5.2

it's not a bad idea to replace them all. replacement recomended at 60,000 miles anyway.

I have a fault code of P0133: 02 Sensor Circuit Slow Response (Bank 11 02 Sensor 1). I would like to replace this sensor myself, but how do I know which sensor it is and where would it be located? I'm told there are 4 of them on my 96 Ram 5.2
I believe there are only 2. One in front of the cat and one behind and yes you should replace both sensors. It will cost you about 70 a unit, but better than getting suck on the Freeway like I did whe the damn things acted up.

Just replaced the O2 sensors (the one in the cat) on my '94 dodge ram 1500. I picked up a O2 sensor at autozone for $50...went to o'reillys the next day and saw that they are giving away a $10 gas card for the same unit....