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There are 4. 2 before the cats(upstream) and 2 after(downstream). They don't last forever, but for now you can just replace the one that is throwing the code. Bank 2 Sensor 2 is the passenger side, rear sensor. The rear sensors only monitor the cats, they do not contribute to the way the engine runs.
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David
'16 2SS M6 black on black, SW long tube full exhaust, NPP, Roto-fab CAI, ported stock TB
'16 2SS M6 black w/Metallic black stripes, Kalahari, 6 piston front (totaled 1/22/20)
'14 Fusion Titanium 2.0T
'83 Jeep Wagoneer
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