Hi, I have a 2001 3.8 V6 Camero and the O2 sensor is gone. I looked at prices for the sensor to see if I could change it but I got three sensors (left rear, right rear and front). Does the Camaro have three sensors? Do I need to replace them all? Any help would be appreciated.

 

Theres 4 sensors. One in each exhaust manifold. So left front and right front. Then Theres one pre catalytic convertor and one after the the catalytic convertor. So up flow and down flow sensors. The 2 in the manifolds are the same and the other 2 I'm not sure about.